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Naval Mobile Construction Battalion 4
Naval Mobile Construction Battalion 4 (NMCB 4) is a Navy Seabee battalion homeported at Port Hueneme, California. Nicknamed the "Pioneers", it is the first of the many CBs created after the original three. The Battalion's current insignia first appeared on its 1953–55 cruisebook. History WWII On 11 June 1942 Naval Construction Battalion 4 was commissioned at NCTC Camp Allen, Norfolk, VA with 32 officers and 1,073 enlisted men. The following month the unit received its military training at Camp Bradford prior to boarding a train for Port Hueneme, Ca. In July the battalion was sent to Bremerton, Washington for transport to Dutch Harbor, Alaska.Naval Construction Battalion 4, Unit History NHHC, Seabee Museum, Port Hueneme, C/ref> Four was the first Construction Battalion in the sector but, was soon joined by CBs 8, 13, 21, and 22. The civilian contractor had been awarded 28 defense contracts of which eight had been completed before the Seabees arrived and took over. Up ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Navy
The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage of its active battle fleet alone exceeding the next 13 navies combined, including 11 allies or partner nations of the United States as of 2015. It has the highest combined battle fleet tonnage (4,635,628 tonnes as of 2019) and the world's largest aircraft carrier fleet, with eleven in service, two new carriers under construction, and five other carriers planned. With 336,978 personnel on active duty and 101,583 in the Ready Reserve, the United States Navy is the third largest of the United States military service branches in terms of personnel. It has 290 deployable combat vessels and more than 2,623 operational aircraft . The United States Navy traces its origins to the Continental Navy, which was established during the American Revo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fort Mears
The Dutch Harbor Naval Operating Base and Fort Mears were the two military installations built next to each other in Dutch Harbor, on Amaknak Island of the Aleutian Islands in Alaska, by the United States in response to the growing war threat with Imperial Japan during World War II. In 1938, the Navy Board recommended the construction which began in July 1940. The first United States Army troops arrived in June 1941 and an air base constructed by the United States Navy was finished in September 1941. At the time of the surprise attack on Pearl Harbor, these were the only military installations in the Aleutian Islands. On June 3–4, 1942, the two bases were bombed by Japanese planes operating out of two aircraft carriers in a two-day event known as the Battle of Dutch Harbor, marking the first enemy aircraft strike on the American continent in history. Description Dutch Harbor occupies the central portion of Amaknak Island, a small island in Unalaska Bay which is separated from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CONUS
''Conus'' is a genus of predatory sea snails, or cone snails, marine gastropod mollusks in the family Conidae.Bouchet, P.; Gofas, S. (2015). Conus Linnaeus, 1758. In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=137813 on 2015-11-12 Prior to 2009, cone snail species had all traditionally been grouped into the single genus ''Conus''. However, ''Conus'' is now more precisely defined, and there are several other accepted genera of cone snails. For a list of the currently accepted genera, see Conidae. Description The thick shell of species in the genus ''Conus'' sensu stricto, is obconic, with the whorls enrolled upon themselves. The spire is short, smooth or tuberculated. The narrow aperture is elongated with parallel margins and is truncated at the base. The operculum is very small relative to the size of the shell. It is corneous, narrowly elongated, with an apical nucleus, and the impressi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aerial Attack
An airstrike, air strike or air raid is an offensive operation carried out by aircraft. Air strikes are delivered from aircraft such as blimps, balloons, fighters, heavy bombers, ground attack aircraft, attack helicopters and drones. The official definition includes all sorts of targets, including enemy air targets, but in popular usage the term is usually narrowed to a tactical (small-scale) attack on a ground or naval objective as opposed to a larger, more general attack such as carpet bombing. Weapons used in an airstrike can range from direct-fire aircraft-mounted cannons and machine guns, rockets and air-to-surface missiles, to various types of aerial bombs, glide bombs, cruise missiles, ballistic missiles, and even directed-energy weapons such as laser weapons. In close air support, air strikes are usually controlled by trained observers on the ground for coordination with ground troops and intelligence in a manner derived from artillery tactics. History Begi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thermal Insulation
Thermal insulation is the reduction of heat transfer (i.e., the transfer of thermal energy between objects of differing temperature) between objects in thermal contact or in range of radiative influence. Thermal insulation can be achieved with specially engineered methods or processes, as well as with suitable object shapes and materials. Heat flow is an inevitable consequence of contact between objects of different temperature. Thermal insulation provides a region of insulation in which thermal conduction is reduced, creating a thermal break or thermal barrier, or thermal radiation is reflected rather than absorbed by the lower-temperature body. The insulating capability of a material is measured as the inverse of thermal conductivity (k). Low thermal conductivity is equivalent to high insulating capability ( resistance value). In thermal engineering, other important properties of insulating materials are product density (ρ) and specific heat capacity (c). Definition T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dynamite
Dynamite is an explosive made of nitroglycerin, sorbents (such as powdered shells or clay), and Stabilizer (chemistry), stabilizers. It was invented by the Swedish people, Swedish chemist and engineer Alfred Nobel in Geesthacht, Northern Germany, and patented in 1867. It rapidly gained wide-scale use as a more robust alternative to gun powder, black powder. History Dynamite was invented by Swedish chemist Alfred Nobel in the 1860s and was the first safely manageable explosive stronger than black powder. Alfred Nobel's father, Immanuel Nobel, was an industrialist, engineer, and inventor. He built bridges and buildings in Stockholm and founded Sweden's first rubber factory. His construction work inspired him to research new methods of blasting rock that were more effective than black powder. After some bad business deals in Sweden, in 1838 Immanuel moved Nobel family, his family to Saint Petersburg, where Alfred and his brothers were educated privately under Swedish and Russi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USS Oriole (AT-136)
USS ''Oriole'' (AM-7) was a acquired by the U.S. Navy for the dangerous task of removing mines from minefields laid in the water to prevent ships from passing. Construction and commissioning ''Oriole'' (Minesweeper No. 7) was laid down on 6 March 1918 at Port Richmond, New York, by the Staten Island Shipbuilding Co.; launched on 3 July 1918; sponsored by Miss Dorothy Leaverton, daughter of an employee of the builders' engineering department, and commissioned at the New York Navy Yard on 5 November 1918. North Sea operations After a shaking-down period engaged in minesweeping operations off the Atlantic Coast, the new ship was assigned to the force assigned the monumental task of sweeping the North Sea Mine Barrage. Consequently, ''Oriole'' proceeded to the Orkney Islands, and arrived at Kirkwall on 29 April 1919. She then spent 112 days in the minefields (punctuated by 41 days in port), and her sailors' efforts accounted for 1,925 mines. Assigned to the Pacific Fleet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USS Rescuer (ARS-18)
USS ''Rescuer'' (ARS-18) was a ''Rescuer''-class rescue and salvage ship commissioned by the U.S. Navy during World War II. Her task was to come to the aid of stricken vessels. Construction and commissioning ''Rescuer'' (ARS-18) was built in 1904 as tug ''Casper'' by United Engine Works, and acquired for the Navy 6 February 1942 by the Port Director, San Pedro, California. Service history Assigned to the 13th Naval District on 7 February 1942, ''Rescuer'' underwent conversion at Seattle, Washington, then headed north to the waters of the Territory of Alaska, where she served during her brief naval career. On 31 December 1942, while engaged in salvaging the stranded Soviet cargo ship SS ''Turksib'' near Scotch Cap () on the southwest corner of Unimak Island in the Aleutian Islands, ''Rescuer'' was carried on to the beach in an 80-mph (129-km/hr) gale, badly holed, and wrecked. Her third engineer fell overboard and drowned. Her name was struck from the Navy list A N ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Steamship
A steamship, often referred to as a steamer, is a type of steam-powered vessel, typically ocean-faring and seaworthy, that is propelled by one or more steam engines that typically move (turn) propellers or paddlewheels. The first steamships came into practical usage during the early 1800s; however, there were exceptions that came before. Steamships usually use the prefix designations of "PS" for ''paddle steamer'' or "SS" for ''screw steamer'' (using a propeller or screw). As paddle steamers became less common, "SS" is assumed by many to stand for "steamship". Ships powered by internal combustion engines use a prefix such as "MV" for ''motor vessel'', so it is not correct to use "SS" for most modern vessels. As steamships were less dependent on wind patterns, new trade routes opened up. The steamship has been described as a "major driver of the first wave of trade globalization (1870–1913)" and contributor to "an increase in international trade that was unprecedented in hu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unimak Island
Unimak Island ( ale, Unimax, russian: Унимак) is the largest island in the Aleutian Islands chain of the U.S. state of Alaska. Geography It is the easternmost island in the Aleutians and, with an area of , the ninth largest island in the United States and the 134th largest island in the world. It is home to Mount Shishaldin, one of the ten most active volcanoes in the world. According to the United States Census Bureau, there were 64 people living on Unimak as of the 2000 census, all of them in the city of False Pass at the eastern end of the island. Cape Lutke is a headland on the island. Cape Pankof is located at the extreme southwest of the island. The Fisher Caldera is a volcanic crater in the west-central part of Unimak. Some characteristics include many volcanic cones and undrained lakes. It is named for Bernard Fisher, a U.S. Geological Survey geologist who was killed in Umnak Pass. Mount Westdahl, in elevation, is a stratovolcano of the Aleutian Range on the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salvage Diving
Salvage diving is the diving work associated with the recovery of all or part of ships, their cargoes, aircraft, and other vehicles and structures which have sunk or fallen into water. In the case of ships it may also refer to repair work done to make an abandoned or distressed but still floating vessel more suitable for towing or propulsion under its own power. The recreational/technical activity known as wreck diving is generally not considered salvage work, though some recovery of artifacts may be done by recreational divers. Most salvage diving is commercial work, or military work, depending on the diving contractor and the purpose for the salvage operation, Similar underwater work may be done by divers as part of forensic investigations into accidents, in which case the procedures may be more closely allied with underwater archaeology than the more basic procedures of advantageous cost/benefit expected in commercial and military operations. In 1978, the U.S. Navy Specia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
