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The Douglas A-26 Invader (designated B-26 between 1948 and 1965) is an American twin-engined
The A-26 was Douglas Aircraft's successor to the
light bomber
A light bomber is a relatively small and fast type of military bomber aircraft that was primarily employed before the 1950s. Such aircraft would typically not carry more than one ton of ordnance.
The earliest light bombers were intended to dro ...
and ground attack aircraft. Built by Douglas Aircraft Company
The Douglas Aircraft Company was an American aerospace manufacturer based in Southern California. It was founded in 1921 by Donald Wills Douglas Sr. and later merged with McDonnell Aircraft in 1967 to form McDonnell Douglas; it then operated as ...
during World War II, the Invader also saw service during several major Cold War
The Cold War is a term commonly used to refer to a period of geopolitical tension between the United States and the Soviet Union and their respective allies, the Western Bloc and the Eastern Bloc. The term '' cold war'' is used because the ...
conflicts. A limited number of highly modified United States Air Force aircraft served in Southeast Asia until 1969. It was a fast aircraft capable of carrying a large bomb load. A range of guns could be fitted to produce a formidable ground-attack aircraft.Wheeler 1992, p. 82.
A redesignation of the type from A-26 to B-26 led to confusion with the Martin B-26 Marauder, which first flew in November 1940, some 20 months before the Douglas design's maiden flight. Although both aircraft were powered by the widely used Pratt & Whitney R-2800 Double Wasp 18-cylinder, double-row radial engine, they were completely different and separate designs, with some 5,300 Marauders produced to 2,503 Invaders.
Design and development
The A-26 was Douglas Aircraft's successor to the A-20 A20, A 20, A.20 or A-20 may refer to:
Vehicles
* A-20 Havoc, a U.S.-designed attack aircraft used in World War II
* A20 heavy tank, a British tank which did not enter production but of which a downsized version became the A22 Churchill tank
* A-20 ...
(DB-7) Havoc, also known as Douglas Boston.
Designed by Ed Heinemann, Robert Donovan, and Ted R. Smith
Ted R. Smith (1906–1976) was an American aircraft designer. He worked for the Douglas Aircraft Company, Aero Design and Engineering Company, and Rockwell Standard Corporation. In 40 years, his designs included the Douglas A-26 Invader (under ...
,Francillon 1979 the innovative NACA 65-215 laminar-flow airfoil wing of the A-26 was the work of project aerodynamicist A.M.O. Smith
Apollo Milton Olin Smith (usually referred to as A.M.O. Smith) (July 2, 1911 – May 1, 1997) was an important figure in the aerodynamics field at Douglas Aircraft from 1938 to 1975 and an early pioneer in the area of computational fluid dynamics. ...
.
The Douglas XA-26 prototype
A prototype is an early sample, model, or release of a product built to test a concept or process. It is a term used in a variety of contexts, including semantics, design, electronics, and Software prototyping, software programming. A prototyp ...
(AAC Ser. No. 41-19504) first flew on 10 July 1942 at Mines Field, El Segundo, with test pilot Benny Howard
Benjamin Odell Howard (February 4, 1904 – December 4, 1970 ), was an American aviator and aeronautical engineer, whose aircraft won the Bendix Trophy and the Thompson Trophy in 1935.cowling changes and elimination of the 
The early A-26 versions were built in two configurations:
* The A-26B gun-nose could be equipped with a combination of armament, including .50 caliber machine guns, 20 or 37mm auto cannon, or an experimental 75mm pack howitzer (never used operationally). The 'B' gun-nose version housed six (and later, eight) M2 Browning, .50 caliber machine guns, officially the "all-purpose nose", later known as the "six-gun nose" or "eight-gun nose".
* The A-26Cs "glass" "Bombardier nose", contained a Norden bombsight for medium-altitude precision bombing. The A-26C nose section included two fixed M-2 guns, but those were eliminated after underwing gun packs or internal guns in the wings proved effective during colder weather.
After about 1,570 production aircraft, three guns were installed in each wing, coinciding with the introduction of the "eight-gun nose" for A-26Bs, giving some configurations as many as 14 .50 in (12.7 mm) machine guns in fixed forward mounts. An A-26C nose section could be replaced with an A-26B nose section, or vice versa, in a few hours, thus physically (and officially) changing the designation and operational role. The "flat-topped" Aircraft canopy, canopy was changed in late 1944 after about 820 production aircraft, to a clamshell style with greatly improved visibility.Thompson 2002
Alongside the pilot in an A-26B, a crew member served as navigator and gun loader for the pilot-operated nose guns. In an A-26C, that crew member served as navigator and Bombardier (air force), bombardier, and relocated to the nose section for the bombing phase of an operation. A few A-26Cs were fitted with dual flight controls, some parts of which could be disabled in flight for access to the nose section. Access for the bombardier was through the lower section of the right instrument panel; he normally sat next to the pilot. This was similar to British designs such as the Avro Lancaster, Lancaster, Bristol Blenheim, Blenheim/Bristol Beaufort, Beaufort, Vickers Wellington, Wellington, etc. A tractor-style "jump seat" was behind the "navigator's seat". In most missions, a third crew member in the rear gunner's compartment operated the remote-controlled dorsal and ventral gun turrets, with access to-and-from the cockpit via the bomb bay only if that was empty. The gunner operated both dorsal and ventral turrets via a novel and complex (and problematic) dual-ended periscope sight, a vertical column running through the center of the rear compartment, with traversing and elevating/depressing periscope sights on each end. The gunner sat on a seat facing rearward looking into a binocular periscope sight mounted on the column, controlling the guns with a pair of handles on the sides of the column. Aimed above the centerline of the aircraft, the mirror in the center of the column 'flipped', showing the gunner a limited view similar to the view the upper periscope was seeing. As he pressed the handles downward, and as the bead passed the centerline, the mirror automatically flipped, transferring the sight "seamlessly" to the lower periscope. The guns aimed in the approximate direction the periscope was aimed, automatically transferring between upper and lower turrets as required, and computing for parallax and other factors. While novel and sound in principle, the developers invested a great deal of time and effort in their attempts to get the system to work effectively, delaying production. As might be expected, the complex system was difficult to maintain in the field.Johnsen 1999
Douglas needed better results from the Invader's second combat test, so ferried A-26s arrived in Europe in late September 1944 for assignment to the Ninth Air Force. The initial deployment involved 18 aircraft and crews assigned to the 553d Squadron of the 386th Bomb Group. This unit flew their first mission on 6 September 1944. No aircraft were lost on the eight test missions, and the Ninth Air Force announced they were satisfied, eventually replacing their A-20s and Martin B-26 Marauder, B-26s with the A-26 Invader.
The first group to convert to the A-26B was 416th Bombardment Group. With it, they entered combat on 17 November, and the 409th Bombardment Group, whose A-26s became operational in late November. Due to a shortage of A-26C variants, the groups flew a combined A-20/A-26 unit until deliveries of the glass-nosed version caught up. Besides bombing and strafing, tactical reconnaissance and night interdiction missions were successful. In contrast to the Pacific-based units, the A-26 was well received by pilots and crew alike, and by 1945, the 9th AF had 11,567 missions, dropping 18,054 tons of bombs, recording seven confirmed kills while losing 67 aircraft.Mesko 1980, p.12.
In Italy, the Twelfth Air Force's 47th Operations Group, 47th Bomb Group also received the A-26 starting in January 1945. They were used against German transport links, and for direct support and interdiction against tanks and troop concentrations in the Po Valley in the final campaigns in Italy.
B-26 Invaders of the 3rd Wing, 3rd Bombardment Group, operating from bases in southern Japan, were among the first USAF aircraft engaged in the Korean War, carrying out missions over South Korea on 27 and 28 June, before carrying out the first USAF bombing mission on North Korea on 29 June 1950, bombing an airfield near Pyongyang.Horne 1984, p. 50.
On 10 August 1950, the Air Force Reserve's 452d Bombardment Wing was activated for Korean service."452 Operations Group (AFRC)"
''Air Force Historical Research Agency'', December 1997. Retrieved: 18 April 2010. It flew its first missions in November 1950 from Itazuke, Japan, providing daylight support, with the 3rd Bomb Wing, consisting of the 8th, 13th, and 90th Bomb Squadrons, flying night missions. Because of the Chinese intervention, they were forced to find another base, so they moved to Miho Air Base on the west coast of Honshū. In early 1951, they moved to Pusan East (K-9) Air Base, continuing their daylight and night-intruder missions. In June 1951, they joined the 3rd Bomb Wing (Kunsan Air Base, Kunsan (K-8)) in night activity only, dividing the target areas, with the 452nd taking the eastern half and the 3rd the western. For their efforts in the Korean War, they received two unit citations and the Korean Presidential Citation. They also received credit for eight campaign operations. In May 1952, they were inactivated. Their aircraft and equipment along with their personnel were absorbed by the 17th Bombardment Wing, 17th Bomb Wing. During their time as an active unit, the 452nd flew 15,000 sorties (7,000 at night) with a loss of 85 crewmen. B-26s were credited with the destruction of 38,500 vehicles, 406 locomotives, 3,700 railway trucks, and seven enemy aircraft on the ground. On 14 September 1951, Captain John S. Walmsley Jr. attacked a supply train. After all his guns simultaneously jammed, he illuminated the target with his searchlight to enable his wingmen to destroy the train. Walmsley was shot down, and posthumously awarded the Medal of Honor. Invaders carried out the last USAF bombing mission of the war 24 minutes before the Korean Armistice Agreement, armistice agreement was signed on 27 June 1953.Francillon 1978, p. 228. In addition to the standard attack versions of the B-26 for night interdiction missions, modified WB-26s and RB-26s of the 67th Tactical Reconnaissance Wing flew critical weather observation and reconnaissance missions in supporting roles.
The aircraft from Laos participated in the early phase of the Vietnam War with the USAF, but with Vietnamese markings as part of Project Farm Gate. Although Farm Gate operated B-26Bs, B-26Cs, and genuine RB-26Cs, many of these aircraft were operated under the designation RB-26C, although they were used in a combat capacity. During 1963, two RB-26Cs were sent to Clark Air Base, Clark AB in the Philippines for modifications, although not with night systems similar to those modified for Black Watch. The two aircraft returned from Black Watch to Farm Gate were redesignated RB-26L to distinguish them from other modified RB-26Cs, and were assigned to Project Sweet Sue. Farm Gate's B-26s operated alongside the other primary strike aircraft of the time, the T-28 Trojan, before both aircraft types were replaced by the Douglas A-1 Skyraider. The B-26s were withdrawn from service in February 1964 after two accidents related to wing-spar fatigue, one during combat in Southeast Asia in August 1963 and one during a demonstration at Eglin AFB, Florida, in February 1964.
On 11 February 1964, two pilots from the 1st Air Commando Wing stationed at Florida's Hurlburt Field died in the crash of a B-26 on Range 52 at Eglin AFB after it lost a wing during pull-out from a demonstration strafing pass. The aircraft was participating in a demonstration of the Special Air Warfare Center's counterinsurgency capabilities, and completed a strafing run demonstration before the incident. SAWC presented the demonstration on an average of twice each month for the previous two years. B-26 aircraft used by USAF Commandos in Vietnam were grounded 8 April 1964 following an investigation into the 11 February incident. B-26 aircraft in use by the South Vietnamese Air Force were also grounded in accordance with the U.S. ruling.
In response to this, the On Mark Engineering Company of Van Nuys, California, was selected by the USAF to extensively upgrade the Invader for its new counterinsurgency role. The first production flight of the B-26K was on 30 May 1964 at the Van Nuys Airport. On Mark converted 40 Invaders to the new B-26K Counter-Invader standard of upgraded engines, propellers, and brakes, remanufactured wings, and wing-tip fuel tanks for use by the 609th Special Operations Squadron. In May 1966, the B-26K was again redesignated A-26A for political reasons (Thailand did not allow U.S. bombers in-country at the time, so the Invaders were redesignated again with an "A", for attack aircraft), and deployed in Thailand to help disrupt supplies moving along the Ho Chi Minh trail. Two of these aircraft were modified with a forward-looking infrared radar (FLIR) system under project Lonesome Tiger, as a part of Operation Shed Light#Sensors, Operation Shed Light.
In early 1961, about 20 B-26Bs, most converted from B-26C configuration, were "sanitized" at Duke Field (also known as Auxiliary Field Three at Eglin AFB), Florida. They had defensive armament removed, and were fitted with the eight-gun nose, underwing drop tanks, and rocket racks. They were flown to a CIA-run base in Guatemala, where training was under way for B-26, C-46, and C-54 Cuban exile air crews by personnel from the Alabama Air National Guard. After transfer to Nicaragua in early April 1961, they were painted in the markings of the Fuerza Aérea Revolucionaria (FAR), the air force of the Cuban government.
On 15 April 1961, crewed by Cuban exiles, eight B-26s of the ''Fuerza Aérea de Liberación'' (FAL) attacked three Cuban airfields to destroy FAR combat aircraft on the ground. On 17 April 1961, FAL B-26s supported the seaborne Bay of Pigs Invasion of Cuba. The conflict ended on 19 April, after the loss of nine FAL B-26s, ten Cuban exiles, and four American aircrew in combat. The FAR flew B-26Cs in the conflict, one of which was downed by friendly fire from a CIA "command ship" with the loss of four Cuban aircrew.
The Central Intelligence Agency, CIA contracted pilots, some employed during the Bay of Pigs Invasion, to fly B-26Ks for ground attack against ''Simba'' rebels in the Congo Crisis. Newly remanufactured B-26K Counter-Invaders were delivered to the Congo via Hurlburt Field in 1964.
In the 1950s, the French Air Force's (') bombing groups (') including Bombardment Group I/19 Gascogne (GB I/19) and GB 1/25 ''Tunisia'', used B-26s, during the First Indochina War, lent to France by the USAF.Dorr and Bishop 1996, pp. 8–10.
Haiphong Cat Bi Airport, Cat Bi-based Douglas B-26 Invaders operated over Dien Bien Phu in March and April 1954 during the Battle of Dien Bien Phu, siege of Dien Bien Phu. In this period, a massive use of Philippines-based USAF B-29s against the Viet Minh heavy artillery, including the potential use of nuclear weapons, was planned by the U.S. and French Joint Chief of Staff as Operation Vulture, but was cancelled by the governments, while at the conclusion of the battle, some of the beleaguered French troops managed to escape through the jungle to neighboring Thailand.
;XA-26A
:Serial no. 41-19505 served as a prototype night fighter with a crew of two - pilot plus radar-operator/gunner
;XA-26B
:Serial no. 41-19588 was a prototype "solid-nosed" attack variant with crew of three: pilot, gun loader/navigator (in front cockpit) plus gunner in rear, and carrying a forward-firing 75 mm (2.75 in) cannon.Francillon 1978, p. 217.
;
:Attack bomber with solid nose carrying six or eight 0.50 in (12.7 mm) machine guns. Production totals: 1,355 A-26Bs were built and delivered, 205 at Tulsa, Oklahoma (A-26B-5-DT to A-26B-25-DT) plus 1,150 at Long Beach, California (A-26B-1-DL to A-26B-66-DL). About 24 more airframes were built at Long Beach but not delivered to USAAF, some of those later sold to other civil and military customers. A-26B was redesignated ''B-26B'' with USAF in 1948.
;TB-26B
:Unarmed variant converted from B-26B for training purposes.
;VB-26B
:Unarmed variant converted from B-26B for administrative purposes.
;
:Attack bomber. Production totals: 1,091 A-26Cs were built and delivered, five at Long Beach, California (A-26C-1-DL and A-26C-2-DL) plus 1,086 at Tulsa, Oklahoma (A-26C-16-DT to A-26B-55-DT). About 53 more airframes were built at Tulsa but not delivered to USAAF, some of those later sold to other civil and military customers. A-26C was redesignated ''B-26C'' with USAF in 1948.
;RB-26C
:Unarmed photo reconnaissance variant converted from B-26C; it carried cameras and flash flares for night photography. Designated ''FA-26C'' prior to 1962.
;TB-26C
:Unarmed variant converted from B-26C for training purposes.
;XA-26D
:Serial no. 44-34776 prototype for the proposed A-26D attack bomber with uprated Chevrolet manufactured R-2800-83 engines, and late model A-26B armament of eight 0.50 in (12.7 mm) machine guns in solid nose and six 0.50 in (12.7 mm) guns in the wing;Mesko 1997, p. 18. series of 750 A-26Ds was cancelled after V-J Day.
;XA-26E
:Serial no. 44-25563 prototype for the A-26E attack bomber. As with the XA-26D, but with an A-26C-type glass nose; a contract for 2,150 A-26E-DTs was cancelled following V-J Day.
;XA-26F
:Serial no. 44-34586 prototype for a high-speed A-26F powered by two R-2800-83 engines driving four-bladed propellers with a s.t. General Electric J31 turbojet installed in the rear fuselage. The prototype reached a top speed of but the series was cancelled as performance gains were not sufficient.
;A-26Z
:Unofficial designation for a proposed postwar production version of the A-26. It was to have a more powerful version of the Pratt & Whitney R-2800 radial engine and was to be fitted with such features as a raised pilot's cockpit canopy, an improved cockpit arrangement, and wingtip drop tanks. If produced, the unglazed nose version would have been designated A-26G and the glazed nose version A-26H. However, in October 1945, the USAAF concluded that enough A-26 aircraft were available to meet postwar needs; consequently, the A-26Z version was not produced.
;JD-1
:U.S. Navy version with one A-26B (AAF Ser. No. 44-34217) and one A-26C (AAF Ser. No. 44-35467) redesignated during World War II, postwar, 150 surplus A-26s for use by land-based Navy utility squadrons (VU) as target tugs and later, drone directors (designated JD-1D) and general utility aircraft. In 1962, the JD-1 and JD-1D were redesignated UB-26J and DB-26J respectively.
;YB-26K
:On Mark Engineering prototype for refurbished attack bomber; modifications included rebuilt, strengthened wings, enlarged tail assembly, new R-2800-103W engines with reversible propellers/propeller spinners, dual controls, wingtip tanks, newer avionics, and increased hardpoint/armament enhancements.
;B-26K
:On Mark Engineering conversions of 40 B-26Bs or TB-26Bs with two B-26Cs and a single JB-26C; changes included fitting of R-2800-52W engines with no propeller spinners and the six wing guns deleted. During operations in Vietnam, in May 1966, the aircraft were reassigned the old attack designation of ''A-26A''. The A-26As were retired in 1969 when they had reached the safe limits of allotted flying time.
;RB-26L
:Two RB-26Cs (44-34718 and 44-35782) were modified for night photography missions.
;B-26N
:Unofficial designation applied to B-26s operated by the French Air Force (') in Algeria as night fighters. These aircraft were modified B-26Cs fitted with AI Mk X radar taken from obsolete Gloster Meteor#Variants, Meteor NF 11 night fighters, two underwing gun packs each with two 0.50 in (12.7 mm) M2 Browning machine guns and SNEB rocket pods.
;WB-26
Weather reconnaissance version first produced and used in the Korean War, 2 used by NOAA from 1960 to 1975.
Since 1945, over 300 A-26s have been on the FAA U.S. Civil Aircraft Register. Perhaps up to 100 of those were probably only registered for ferry flights from USAF bases such as Davis-Monthan AFB, AZ, and Hill AFB, UT, to civil airports and stored as candidates for sale on the civil or overseas military markets.
The initial main civil uses were as "executive" personnel transports with minimal modifications such as removal of military features, bomb-bay doors sealed shut, passenger-entry stairs in bomb bay, and the conversion of the fuselage to accept six to eight passengers. Improvements developed considerably until the early 1960s, when purpose-built executive types such as the turboprop Gulfstream I became available.Grinsell 1974, p. 44.
During the mid-1950s, A-26s were tested and used as air tankers for suppression of forest and wildland fires, and briefly used borate-based retardants, hence the inaccurate and unofficial term "borate bombers". Borate was later discontinued due to its undesirable ecologic effects, replaced with retardant mixtures of water, clays, fertilizers, and red dyes. That use of A-26s on USDA contracts was discontinued in major regions by about 1973, after many of the A-26 air tankers found willing purchasers in Canada.
Much early development of conversions was carried out by Grand Central Aircraft, whose drawings and personnel were taken up by the On Mark Engineering Company of Van Nuys, California, from about 1955. By the 1960s, On Mark had an exclusive license from Douglas Aircraft Company for manufacture and sale of parts for A-26s. The on Mark Executive (1956), the On Mark Marketeer (1957), and the pressurized On Mark Marksman (1961) were products of this effort.
A significant conversion was the Rock Island Monarch 26, while less numerous and more basic conversions for executive operations were carried out by Wold Engineering, LB Smith Aircraft Corp., R. G. LeTourneau Inc, Rhodes-Berry Company and Lockheed Corporation, Lockheed Aircraft Service Inc.
Garrett AiResearch used two A-26 variants as testbeds for turbine engines; see also XA-26F above.
"A-26B Invaders - Warton - 29th November 1944 - Bombers in the Marsh"
''Lancashire Investigative Team''. Retrieved: 19 December 2010.
Photo of prototype XA-26 41-19504Manual: (1945) AN 01-40AJ-2 Erection and Maintenance Instructions for Army Models A-26B and A-26C AirplanesA-26 Lady Liberty - Confederate Air ForceHill Aerospace Museum: ''Douglas A-26 "Invader" Information''Hurlburt AFB: ''Fact Sheets: A-26 Counter-Invader''Martin J Simpson's A-26 history website''Popular Science'', July 1945, "Plane of Many Faces"Spherical panoramas of the interior of the 'Spirit of North Carolina'
{{Authority control Aircraft first flown in 1942 Douglas aircraft, A-26 Invader Mid-wing aircraft 1940s United States attack aircraft 1940s United States bomber aircraft World War II ground attack aircraft of the United States Twin piston-engined tractor aircraft
propeller
A propeller (colloquially often called a screw if on a ship or an airscrew if on an aircraft) is a device with a rotating hub and radiating blades that are set at a pitch to form a helical spiral which, when rotated, exerts linear thrust upon ...
spinners on production aircraft. During testing, the nose wheel was found to be structurally inadequate, thus the nose gear was redesigned and made more structurally sound.
The early A-26 versions were built in two configurations:
* The A-26B gun-nose could be equipped with a combination of armament, including .50 caliber machine guns, 20 or 37mm auto cannon, or an experimental 75mm pack howitzer (never used operationally). The 'B' gun-nose version housed six (and later, eight) M2 Browning, .50 caliber machine guns, officially the "all-purpose nose", later known as the "six-gun nose" or "eight-gun nose".
* The A-26Cs "glass" "Bombardier nose", contained a Norden bombsight for medium-altitude precision bombing. The A-26C nose section included two fixed M-2 guns, but those were eliminated after underwing gun packs or internal guns in the wings proved effective during colder weather.
After about 1,570 production aircraft, three guns were installed in each wing, coinciding with the introduction of the "eight-gun nose" for A-26Bs, giving some configurations as many as 14 .50 in (12.7 mm) machine guns in fixed forward mounts. An A-26C nose section could be replaced with an A-26B nose section, or vice versa, in a few hours, thus physically (and officially) changing the designation and operational role. The "flat-topped" Aircraft canopy, canopy was changed in late 1944 after about 820 production aircraft, to a clamshell style with greatly improved visibility.Thompson 2002
Alongside the pilot in an A-26B, a crew member served as navigator and gun loader for the pilot-operated nose guns. In an A-26C, that crew member served as navigator and Bombardier (air force), bombardier, and relocated to the nose section for the bombing phase of an operation. A few A-26Cs were fitted with dual flight controls, some parts of which could be disabled in flight for access to the nose section. Access for the bombardier was through the lower section of the right instrument panel; he normally sat next to the pilot. This was similar to British designs such as the Avro Lancaster, Lancaster, Bristol Blenheim, Blenheim/Bristol Beaufort, Beaufort, Vickers Wellington, Wellington, etc. A tractor-style "jump seat" was behind the "navigator's seat". In most missions, a third crew member in the rear gunner's compartment operated the remote-controlled dorsal and ventral gun turrets, with access to-and-from the cockpit via the bomb bay only if that was empty. The gunner operated both dorsal and ventral turrets via a novel and complex (and problematic) dual-ended periscope sight, a vertical column running through the center of the rear compartment, with traversing and elevating/depressing periscope sights on each end. The gunner sat on a seat facing rearward looking into a binocular periscope sight mounted on the column, controlling the guns with a pair of handles on the sides of the column. Aimed above the centerline of the aircraft, the mirror in the center of the column 'flipped', showing the gunner a limited view similar to the view the upper periscope was seeing. As he pressed the handles downward, and as the bead passed the centerline, the mirror automatically flipped, transferring the sight "seamlessly" to the lower periscope. The guns aimed in the approximate direction the periscope was aimed, automatically transferring between upper and lower turrets as required, and computing for parallax and other factors. While novel and sound in principle, the developers invested a great deal of time and effort in their attempts to get the system to work effectively, delaying production. As might be expected, the complex system was difficult to maintain in the field.Johnsen 1999
Operational history
World War II
Pacific
The Douglas company delivered production model A-26B aircraft to the United States Army Air Forces (USAAF) on 10 September 1943, with the new bomber seeing action with the Fifth Air Force in the South West Pacific theatre of World War II, Southwest Pacific theater on 23 June 1944, while Empire of Japan, Japanese-held islands near Manokwari were attacked. The pilots in the 3rd Bomb Group's 13th Squadron, "The Grim Reapers", receiving the first four A-26s for evaluation, suddenly discovered the downward view from the cockpit was hindered by the engines, and woefully inadequate for its intended role as ground support. General George Kenney, commander of the Pacific Air Forces, Far East Air Forces, stated, "We do not want the A-26 under any circumstances as a replacement for anything."O'Leary 2002, p. 42. Until changes could be made, the 3rd Bombardment Group requested additional Douglas A-20 Havocs, although both types were used in composite flights.Mesko 1980, p. 17. The 319th Bomb Group worked on the A-26 in March 1945, joining the initial 3rd BG, with the 319th flying until 12 August 1945. The A-26 operations wound down in mid-August 1945 after a few dozen missions. Some A-20 and North American B-25 Mitchell, B-25 AAF units in the Pacific received the A-26 for trials in limited quantities.Europe
Douglas needed better results from the Invader's second combat test, so ferried A-26s arrived in Europe in late September 1944 for assignment to the Ninth Air Force. The initial deployment involved 18 aircraft and crews assigned to the 553d Squadron of the 386th Bomb Group. This unit flew their first mission on 6 September 1944. No aircraft were lost on the eight test missions, and the Ninth Air Force announced they were satisfied, eventually replacing their A-20s and Martin B-26 Marauder, B-26s with the A-26 Invader.
The first group to convert to the A-26B was 416th Bombardment Group. With it, they entered combat on 17 November, and the 409th Bombardment Group, whose A-26s became operational in late November. Due to a shortage of A-26C variants, the groups flew a combined A-20/A-26 unit until deliveries of the glass-nosed version caught up. Besides bombing and strafing, tactical reconnaissance and night interdiction missions were successful. In contrast to the Pacific-based units, the A-26 was well received by pilots and crew alike, and by 1945, the 9th AF had 11,567 missions, dropping 18,054 tons of bombs, recording seven confirmed kills while losing 67 aircraft.Mesko 1980, p.12.
In Italy, the Twelfth Air Force's 47th Operations Group, 47th Bomb Group also received the A-26 starting in January 1945. They were used against German transport links, and for direct support and interdiction against tanks and troop concentrations in the Po Valley in the final campaigns in Italy.
Postwar era
United States
With the establishment of the United States Air Force (USAF) as an independent service in 1947, the Strategic Air Command operated the again redesignated B-26 as an RB-26 reconnaissance aircraft in service 1949 to 1950. U.S. Air Forces in Europe continued operating the B-26 until 1957. Tactical Air Command operated the aircraft as both a B-26 and later designated back to A-26; the final variant was designated B-26K until 1966, then it again became the A-26A. This final version continued in service through the late 1960s with active-duty special-operations TAC units, and through 1972 with TAC-gained special-operations units of the Air National Guard. The U.S. Navy obtained Invaders from the USAF to use these aircraft in their utility squadrons (VU) for target towing and general utility until superseded by the DC-130A variant of the C-130 Hercules. The Navy designation was JD-1 and JD-1D until 1962, then the JD-1 was redesignated UB-26J. The JD-1D was also used under the designation of DB-26J. The CIA also used the type for covert operations. The last A-26 in active US service was assigned to the Air National Guard; that aircraft was retired from military service in 1972 by the USAF and the National Guard of the United States, National Guard Bureau, and donated to the National Air and Space Museum.=Korean War
=
B-26 Invaders of the 3rd Wing, 3rd Bombardment Group, operating from bases in southern Japan, were among the first USAF aircraft engaged in the Korean War, carrying out missions over South Korea on 27 and 28 June, before carrying out the first USAF bombing mission on North Korea on 29 June 1950, bombing an airfield near Pyongyang.Horne 1984, p. 50.
On 10 August 1950, the Air Force Reserve's 452d Bombardment Wing was activated for Korean service."452 Operations Group (AFRC)"''Air Force Historical Research Agency'', December 1997. Retrieved: 18 April 2010. It flew its first missions in November 1950 from Itazuke, Japan, providing daylight support, with the 3rd Bomb Wing, consisting of the 8th, 13th, and 90th Bomb Squadrons, flying night missions. Because of the Chinese intervention, they were forced to find another base, so they moved to Miho Air Base on the west coast of Honshū. In early 1951, they moved to Pusan East (K-9) Air Base, continuing their daylight and night-intruder missions. In June 1951, they joined the 3rd Bomb Wing (Kunsan Air Base, Kunsan (K-8)) in night activity only, dividing the target areas, with the 452nd taking the eastern half and the 3rd the western. For their efforts in the Korean War, they received two unit citations and the Korean Presidential Citation. They also received credit for eight campaign operations. In May 1952, they were inactivated. Their aircraft and equipment along with their personnel were absorbed by the 17th Bombardment Wing, 17th Bomb Wing. During their time as an active unit, the 452nd flew 15,000 sorties (7,000 at night) with a loss of 85 crewmen. B-26s were credited with the destruction of 38,500 vehicles, 406 locomotives, 3,700 railway trucks, and seven enemy aircraft on the ground. On 14 September 1951, Captain John S. Walmsley Jr. attacked a supply train. After all his guns simultaneously jammed, he illuminated the target with his searchlight to enable his wingmen to destroy the train. Walmsley was shot down, and posthumously awarded the Medal of Honor. Invaders carried out the last USAF bombing mission of the war 24 minutes before the Korean Armistice Agreement, armistice agreement was signed on 27 June 1953.Francillon 1978, p. 228. In addition to the standard attack versions of the B-26 for night interdiction missions, modified WB-26s and RB-26s of the 67th Tactical Reconnaissance Wing flew critical weather observation and reconnaissance missions in supporting roles.
=Southeast Asia
= The first B-26s to arrive in Southeast Asia deployed to Takhli Royal Thai Air Force Base, Takhli RTAFB, Thailand in December 1960. These unmarked aircraft, operated under the auspices of the U.S. CIA (Central Intelligence Agency), were augmented by an additional 16 aircraft— 12 B-26Bs and B-26Cs plus four RB-26Cs under Operation Millpond. Their mission was assisting the Royal Lao Government in fighting the Pathet Lao. The repercussions from the Bay of Pigs invasion meant no combat missions are known flown, although RB-26Cs operated over Laos until the end of 1961. Then, the aircraft operated in South Vietnam under Project Farm Gate (military operation), Farm Gate. The only other deployment of B-26 aircraft to Laos prior to the introduction of the B-26K/A-26A was the deployment of two RB-26C aircraft modified for night reconnaissance during May–July 1962 under Project Black Watch. These aircraft, drawn from Farm Gate stocks, were returned at the end of these missions.Smith 1966, p. 7.
The aircraft from Laos participated in the early phase of the Vietnam War with the USAF, but with Vietnamese markings as part of Project Farm Gate. Although Farm Gate operated B-26Bs, B-26Cs, and genuine RB-26Cs, many of these aircraft were operated under the designation RB-26C, although they were used in a combat capacity. During 1963, two RB-26Cs were sent to Clark Air Base, Clark AB in the Philippines for modifications, although not with night systems similar to those modified for Black Watch. The two aircraft returned from Black Watch to Farm Gate were redesignated RB-26L to distinguish them from other modified RB-26Cs, and were assigned to Project Sweet Sue. Farm Gate's B-26s operated alongside the other primary strike aircraft of the time, the T-28 Trojan, before both aircraft types were replaced by the Douglas A-1 Skyraider. The B-26s were withdrawn from service in February 1964 after two accidents related to wing-spar fatigue, one during combat in Southeast Asia in August 1963 and one during a demonstration at Eglin AFB, Florida, in February 1964.
On 11 February 1964, two pilots from the 1st Air Commando Wing stationed at Florida's Hurlburt Field died in the crash of a B-26 on Range 52 at Eglin AFB after it lost a wing during pull-out from a demonstration strafing pass. The aircraft was participating in a demonstration of the Special Air Warfare Center's counterinsurgency capabilities, and completed a strafing run demonstration before the incident. SAWC presented the demonstration on an average of twice each month for the previous two years. B-26 aircraft used by USAF Commandos in Vietnam were grounded 8 April 1964 following an investigation into the 11 February incident. B-26 aircraft in use by the South Vietnamese Air Force were also grounded in accordance with the U.S. ruling.
In response to this, the On Mark Engineering Company of Van Nuys, California, was selected by the USAF to extensively upgrade the Invader for its new counterinsurgency role. The first production flight of the B-26K was on 30 May 1964 at the Van Nuys Airport. On Mark converted 40 Invaders to the new B-26K Counter-Invader standard of upgraded engines, propellers, and brakes, remanufactured wings, and wing-tip fuel tanks for use by the 609th Special Operations Squadron. In May 1966, the B-26K was again redesignated A-26A for political reasons (Thailand did not allow U.S. bombers in-country at the time, so the Invaders were redesignated again with an "A", for attack aircraft), and deployed in Thailand to help disrupt supplies moving along the Ho Chi Minh trail. Two of these aircraft were modified with a forward-looking infrared radar (FLIR) system under project Lonesome Tiger, as a part of Operation Shed Light#Sensors, Operation Shed Light.
=CIA
=
In early 1961, about 20 B-26Bs, most converted from B-26C configuration, were "sanitized" at Duke Field (also known as Auxiliary Field Three at Eglin AFB), Florida. They had defensive armament removed, and were fitted with the eight-gun nose, underwing drop tanks, and rocket racks. They were flown to a CIA-run base in Guatemala, where training was under way for B-26, C-46, and C-54 Cuban exile air crews by personnel from the Alabama Air National Guard. After transfer to Nicaragua in early April 1961, they were painted in the markings of the Fuerza Aérea Revolucionaria (FAR), the air force of the Cuban government.
On 15 April 1961, crewed by Cuban exiles, eight B-26s of the ''Fuerza Aérea de Liberación'' (FAL) attacked three Cuban airfields to destroy FAR combat aircraft on the ground. On 17 April 1961, FAL B-26s supported the seaborne Bay of Pigs Invasion of Cuba. The conflict ended on 19 April, after the loss of nine FAL B-26s, ten Cuban exiles, and four American aircrew in combat. The FAR flew B-26Cs in the conflict, one of which was downed by friendly fire from a CIA "command ship" with the loss of four Cuban aircrew.
The Central Intelligence Agency, CIA contracted pilots, some employed during the Bay of Pigs Invasion, to fly B-26Ks for ground attack against ''Simba'' rebels in the Congo Crisis. Newly remanufactured B-26K Counter-Invaders were delivered to the Congo via Hurlburt Field in 1964.
France
In the 1950s, the French Air Force's (') bombing groups (') including Bombardment Group I/19 Gascogne (GB I/19) and GB 1/25 ''Tunisia'', used B-26s, during the First Indochina War, lent to France by the USAF.Dorr and Bishop 1996, pp. 8–10.
Haiphong Cat Bi Airport, Cat Bi-based Douglas B-26 Invaders operated over Dien Bien Phu in March and April 1954 during the Battle of Dien Bien Phu, siege of Dien Bien Phu. In this period, a massive use of Philippines-based USAF B-29s against the Viet Minh heavy artillery, including the potential use of nuclear weapons, was planned by the U.S. and French Joint Chief of Staff as Operation Vulture, but was cancelled by the governments, while at the conclusion of the battle, some of the beleaguered French troops managed to escape through the jungle to neighboring Thailand.
Indonesia
Concerned about Indonesian President Sukarno's communist leanings, the CIA started Operation Haik in 1958 to overthrow his Guided Democracy in Indonesia regime. The covert operation committed at least a dozen B-26 Invaders in support of rebel forces. On 18 May 1958, American contract pilot Allen Pope's blacked-out B-26 was initially hit by antiaircraft ground fire and then brought down by a North American P-51 Mustang flown by Capt. Ignatius Dewanto (the only known air-to-air shoot-down in the history of the Indonesian Air Force). The capture and trial of Lieutenant Pope brought a quick end to Operation Haik, but the capabilities of the Invader were not lost on the Indonesian government. In 1959, the government purchased six aircraft at Davis-Monthan AFB, which were ferried to Indonesia in full military markings during mid-1960. Used in a number of actions against rebels in various areas, these aircraft went on to long follow-up careers. The last operational flights of three final survivors were in 1976, supporting the Indonesian invasion of East Timor. In 1977, the last two flying aircraft were retired.Portugal
The Portuguese Air Force purchased Invaders covertly for use in Portuguese Angola in 1965, during the Portuguese Colonial War.Hagedorn and Hellström 1994Democratic Republic of the Congo
B-26s were used in support of the Operation Dragon Rouge, Dragon operations to liberate Western hostages held by Simba terrorists during the Congo Crisis.Andrew Hudson, 2012, "Congo Unravelled: Military Operations from Independence to the Mercenary Revolt 1960–68 (Africa@War Book 6)", Chapt.6Biafra
Biafra used two provisionally armed ("provo") B-26s in combat during Nigerian Civil War in 1967, flown, among others, by Jan Zumbach.Variants
Douglas/U.S. military variants
Many of the A-26/B-26 Invader's production run of 2,452 were early A-26Bs and A-26Cs. ;XA-26 :Serial no. 41-19504 served as the prototype for the series; initially flown with dummy armament
;XA-26A
:Serial no. 41-19505 served as a prototype night fighter with a crew of two - pilot plus radar-operator/gunner
;XA-26B
:Serial no. 41-19588 was a prototype "solid-nosed" attack variant with crew of three: pilot, gun loader/navigator (in front cockpit) plus gunner in rear, and carrying a forward-firing 75 mm (2.75 in) cannon.Francillon 1978, p. 217.
;
:Attack bomber with solid nose carrying six or eight 0.50 in (12.7 mm) machine guns. Production totals: 1,355 A-26Bs were built and delivered, 205 at Tulsa, Oklahoma (A-26B-5-DT to A-26B-25-DT) plus 1,150 at Long Beach, California (A-26B-1-DL to A-26B-66-DL). About 24 more airframes were built at Long Beach but not delivered to USAAF, some of those later sold to other civil and military customers. A-26B was redesignated ''B-26B'' with USAF in 1948.
;TB-26B
:Unarmed variant converted from B-26B for training purposes.
;VB-26B
:Unarmed variant converted from B-26B for administrative purposes.
;
:Attack bomber. Production totals: 1,091 A-26Cs were built and delivered, five at Long Beach, California (A-26C-1-DL and A-26C-2-DL) plus 1,086 at Tulsa, Oklahoma (A-26C-16-DT to A-26B-55-DT). About 53 more airframes were built at Tulsa but not delivered to USAAF, some of those later sold to other civil and military customers. A-26C was redesignated ''B-26C'' with USAF in 1948.
;RB-26C
:Unarmed photo reconnaissance variant converted from B-26C; it carried cameras and flash flares for night photography. Designated ''FA-26C'' prior to 1962.
;TB-26C
:Unarmed variant converted from B-26C for training purposes.
;XA-26D
:Serial no. 44-34776 prototype for the proposed A-26D attack bomber with uprated Chevrolet manufactured R-2800-83 engines, and late model A-26B armament of eight 0.50 in (12.7 mm) machine guns in solid nose and six 0.50 in (12.7 mm) guns in the wing;Mesko 1997, p. 18. series of 750 A-26Ds was cancelled after V-J Day.
;XA-26E
:Serial no. 44-25563 prototype for the A-26E attack bomber. As with the XA-26D, but with an A-26C-type glass nose; a contract for 2,150 A-26E-DTs was cancelled following V-J Day.
;XA-26F
:Serial no. 44-34586 prototype for a high-speed A-26F powered by two R-2800-83 engines driving four-bladed propellers with a s.t. General Electric J31 turbojet installed in the rear fuselage. The prototype reached a top speed of but the series was cancelled as performance gains were not sufficient.
;A-26Z
:Unofficial designation for a proposed postwar production version of the A-26. It was to have a more powerful version of the Pratt & Whitney R-2800 radial engine and was to be fitted with such features as a raised pilot's cockpit canopy, an improved cockpit arrangement, and wingtip drop tanks. If produced, the unglazed nose version would have been designated A-26G and the glazed nose version A-26H. However, in October 1945, the USAAF concluded that enough A-26 aircraft were available to meet postwar needs; consequently, the A-26Z version was not produced.
;JD-1
:U.S. Navy version with one A-26B (AAF Ser. No. 44-34217) and one A-26C (AAF Ser. No. 44-35467) redesignated during World War II, postwar, 150 surplus A-26s for use by land-based Navy utility squadrons (VU) as target tugs and later, drone directors (designated JD-1D) and general utility aircraft. In 1962, the JD-1 and JD-1D were redesignated UB-26J and DB-26J respectively.
;YB-26K
:On Mark Engineering prototype for refurbished attack bomber; modifications included rebuilt, strengthened wings, enlarged tail assembly, new R-2800-103W engines with reversible propellers/propeller spinners, dual controls, wingtip tanks, newer avionics, and increased hardpoint/armament enhancements.
;B-26K
:On Mark Engineering conversions of 40 B-26Bs or TB-26Bs with two B-26Cs and a single JB-26C; changes included fitting of R-2800-52W engines with no propeller spinners and the six wing guns deleted. During operations in Vietnam, in May 1966, the aircraft were reassigned the old attack designation of ''A-26A''. The A-26As were retired in 1969 when they had reached the safe limits of allotted flying time.
;RB-26L
:Two RB-26Cs (44-34718 and 44-35782) were modified for night photography missions.
;B-26N
:Unofficial designation applied to B-26s operated by the French Air Force (') in Algeria as night fighters. These aircraft were modified B-26Cs fitted with AI Mk X radar taken from obsolete Gloster Meteor#Variants, Meteor NF 11 night fighters, two underwing gun packs each with two 0.50 in (12.7 mm) M2 Browning machine guns and SNEB rocket pods.
;WB-26
Weather reconnaissance version first produced and used in the Korean War, 2 used by NOAA from 1960 to 1975.
Third-party civil variants
Since 1945, over 300 A-26s have been on the FAA U.S. Civil Aircraft Register. Perhaps up to 100 of those were probably only registered for ferry flights from USAF bases such as Davis-Monthan AFB, AZ, and Hill AFB, UT, to civil airports and stored as candidates for sale on the civil or overseas military markets.
The initial main civil uses were as "executive" personnel transports with minimal modifications such as removal of military features, bomb-bay doors sealed shut, passenger-entry stairs in bomb bay, and the conversion of the fuselage to accept six to eight passengers. Improvements developed considerably until the early 1960s, when purpose-built executive types such as the turboprop Gulfstream I became available.Grinsell 1974, p. 44.
During the mid-1950s, A-26s were tested and used as air tankers for suppression of forest and wildland fires, and briefly used borate-based retardants, hence the inaccurate and unofficial term "borate bombers". Borate was later discontinued due to its undesirable ecologic effects, replaced with retardant mixtures of water, clays, fertilizers, and red dyes. That use of A-26s on USDA contracts was discontinued in major regions by about 1973, after many of the A-26 air tankers found willing purchasers in Canada.
Much early development of conversions was carried out by Grand Central Aircraft, whose drawings and personnel were taken up by the On Mark Engineering Company of Van Nuys, California, from about 1955. By the 1960s, On Mark had an exclusive license from Douglas Aircraft Company for manufacture and sale of parts for A-26s. The on Mark Executive (1956), the On Mark Marketeer (1957), and the pressurized On Mark Marksman (1961) were products of this effort.
A significant conversion was the Rock Island Monarch 26, while less numerous and more basic conversions for executive operations were carried out by Wold Engineering, LB Smith Aircraft Corp., R. G. LeTourneau Inc, Rhodes-Berry Company and Lockheed Corporation, Lockheed Aircraft Service Inc.
Garrett AiResearch used two A-26 variants as testbeds for turbine engines; see also XA-26F above.
Operators (military and civilian)
Surviving aircraft
Specifications (A-26B Invader)
Notable appearances in media
In July 2005, the archaeological television program ''Time Team'' of the UK's Channel 4, along with members of RAF Millom#Museum, RAF Millom Museum, took part in a major project to excavate the crash sites of two A-26 Invader aircraft after the aircraft collided shortly after take-off over marshes close to the then USAAF BAD 2 airbase at RAF Warton, Warton in Lancashire on 29 November 1944. The aircraft, A-26B-10-DT ''43-22298'' and A-26B-15-DT ''43-22336'', were en route to Brétigny, Oise, in northern France for service with the 341st Air Refueling Squadron, 641st Bombardment Squadron of the 409th Bombardment Group.''Lancashire Investigative Team''. Retrieved: 19 December 2010.
See also
References
Notes
Citations
Bibliography
*A Former USAF Pilot. "Talkback". ''Air Enthusiast''. No. 9, February–May 1979. p. 80. * Dorr, Robert F. and Chris Bishop. ''Vietnam Air War Debrief''. London: Aerospace Publishing, 1996. . * Dorr, Robert F. and Warren Thompson. ''Korean Air War''. St. Paul, Minnesota: MBI, 2003. . * Francillon, René. "The Douglas Invader Story". ''Air Enthusiast'', Number Seven, July–September 1978, pp. 215–234. Bromley, Kent, UK: Pilot Press Ltd., 1978. * Francillon, René. ''McDonnell Douglas Aircraft Since 1920: Volume I''. London: Putnam, 1979. . * Futrell, Robert F. ''The United States Air Force in Korea, 1950–53''. Washington, D.C.: Air Force History Office, 1997, First edition 1961. . * * Gallemi, Francis. ''A-26B/C Invader (Warbird Profile 1)''. Vaudreuil, Quebec, Canada: Aries Publications, 1994. . * * Grinsell, Bob. "Invader". ''Wings'' Vol. 4, No. 3, June 1974. * Hagedorn, Dan. ''Central American and Caribbean Air Forces''. Staplefield, West Sussex, UK: Air Britain (Historians Ltd.), 1993. . * Hagedorn, Dan and Leif Hellström. ''Foreign Invaders, the Douglas Invader in Foreign Military and US Clandestine Service''. Earl Shilton, Leicester, UK: Midland Publishing, 1994. . * * Horne, John E. "Douglas B-26s in Korea". ''Air Enthusiast'', Number 24, April—July 1984. Bromley, Kent UK: Pilot Press. pp. 50–59. *Hunnicutt, Richard P. "Talkback". ''Air Enthusiast''. No. 9, February–May 1979. p. 79. * Johnsen, Frederick A. ''Douglas A-26 Invader''. North Branch, Minnesota: Specialty Press, 1999. . *Lopes, Mario Canoniga. "Talkback". ''Air Enthusiast''. No. 9, February–May 1979. p. 79. * Mesko, Jim. ''A-26 Invader in Action'' (Aircraft Number 37). Carrollton, Texas: Squadron/Signal Publications, 1980. . **''A-26 Invader in Action'' (Aircraft Number 134). Carrollton, Texas: Squadron/Signal Publications, 1993. . **''VNAF, Republic of Vietnam Air Force 1945-1975''. Carrollton, Texas: Squadron/Signal Publications, 1987. . * Mikesh, Robert C. "Flying the Invader: Pilot Notes for the Douglas A-26". ''Air Enthusiast'', Number Seven. July–September 1978. Bromley, Kent, UK: Pilot Press Ltd., 1978, pp. 234–236. * O'Leary, Michael. "Database:Douglas Invader". ''Aeroplane'', May 2002, Vol. 30, No.5, pp. 37–58. London: IPC. * *Roeder, Jim. ''A-26 Invader Units of World War 2: Osprey Combat Aircraft 82''. Botley, UK: Osprey Publishing, 2010. * Smith, Mark E. ''USAF Reconnaissance in South East Asia (1961–66)''. San Francisco: Headquarters, Pacific Air Force, Department of the Air Force, 1966. * Thompson, Scott. ''Douglas A-26 and B-26 Invader''. Ramsbury, Marlborough, Wiltshire, UK: Crowood Press Ltd., 2002. . * Thompson, Warren. ''B-26 Invader Units over Korea''. Botley, UK: Osprey Publishing, 2000. . * ''Volume I Operation Shed Light Study Report''. Washington, D.C.: Headquarters, DCS Research and Development, Headquarters, United States Air Force, 1966. * Wheeler, Barry C. ''The Hamlyn Guide to Military Aircraft Markings''. London: Chancellor Press, 1992. . * Winchester, Jim. "Douglas A-26 Invader". ''Aircraft of World War II''. London: Grange Books, 2004. . *External links
Photo of prototype XA-26 41-19504
{{Authority control Aircraft first flown in 1942 Douglas aircraft, A-26 Invader Mid-wing aircraft 1940s United States attack aircraft 1940s United States bomber aircraft World War II ground attack aircraft of the United States Twin piston-engined tractor aircraft