521st (Kent And Sussex) Coast Regiment, Royal Artillery
521st may refer to: * 521st Air Defense Group, disbanded United States Air Force organization *521st Air Mobility Operations Wing (521 AMOW), part of Air Mobility Command, stationed at Ramstein Air Base, Germany * 521st Fighter-Bomber Squadron, inactive United States Air Force unit See also * 521 (number) * 521, the year 521 (DXXI) of the Julian calendar *521 BC The year 521 BC was a year of the pre-Julian Roman calendar. In the Roman Empire, it was known as year 233 '' Ab urbe condita''. The denomination 521 BC for this year has been used since the early medieval period, when the Anno Domini calendar ...

521st Air Defense Group
The 521st Air Defense Group is a disbanded United States Air Force organization. Its last assignment was with the 31st Air Division at Sioux City Municipal Airport, Iowa, where it was inactivated in 1955. The group was originally activated as a support unit for the 310th Bombardment Group at the end of World War II in Italy and then redeployed to the United States where it was inactivated in 1945. The group was activated once again in 1953, when ADC established it as the headquarters for a dispersed fighter-interceptor squadron and the medical, maintenance, and administrative squadrons supporting it. It was replaced in 1955 when ADC transferred its mission, equipment, and personnel to the 53d Fighter Group in a project that replaced air defense groups commanding fighter squadrons with fighter groups with distinguished records during World War II. World War II The group was first activated as the 521st Air Service Group in a reorganization of Army Air Forces (AAF) support gr ...
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521st Air Mobility Operations Wing
The 521st Air Mobility Operations Wing (521 AMOW) is part of Air Mobility Command and is stationed at Ramstein Air Base, Germany. It coordinates logistical air movements into, out of, and through Europe. The 521st AMOW expedites warfighting and humanitarian efforts by the United States Air Force throughout Europe, the Middle East, and Africa. It provides all command and control, en route maintenance support and air transportation services for air mobility operations in its area of responsibility. It performs this through aircraft maintenance units, maintenance operations centers, quality assurance, regional training center, fuel cell, aerospace ground equipment, forward supply location, and maintenance recovery teams. It operates air terminal operations centers, providing passenger and fleet services, cargo processing, special handling, ramp services, and load planning. The Wing is composed of two groups. These groups are assigned twelve squadrons and fourteen other geographi ...
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521st Fighter-Bomber Squadron
The 521st Fighter-Bomber Squadron is an inactive United States Air Force unit. Its last was assigned to the 415th Bombardment Group, stationed at Dalhart Army Airfield, Texas. It was inactivated on 5 Apr 1944. History Established in early 1943 as an A-24 dive bomber squadron. Assigned to the Army Air Forces School of Applied Tactics, Air University in Florida as a training unit to develop combat tactics to be used by overseas combat units. Also equipped with P-39 fighters and A-36 dive bombers with the phaseout of the A-24. When AAFSAT closed, was re-assigned as a B-25 medium training squadron and supported Army maneuvers. Inactivated in April 1944 with re-organization of training command designations. Lineage * Constituted 667th Bombardment Squadron (Dive) on 12 Feb 1943. : Activated on 15 Feb 1943. : Re-designated 521st Fighter-Bomber Squadron 10 Aug 1943. : Disbanded on 5 Apr 1944. Assignments * 415th Bombardment Group, 15 Feb 1943-5 Apr 1944. Stations * Alachua ...
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521 (number)
500 (five hundred) is the natural number following 499 and preceding 501. Mathematical properties 500 = 22 × 53. It is an Achilles number and an Harshad number, meaning it is divisible by the sum of its digits. It is the number of planar partitions of 10. Other fields Five hundred is also *the number that many NASCAR races often use at the end of their race names (e.g., Daytona 500), to denote the length of the race (in miles, kilometers or laps). *the longest advertised distance (in miles) of the IndyCar Series and its premier race, the Indianapolis 500. Slang names * Monkey (UK slang for £500; USA slang for $500) Integers from 501 to 599 500s 501 501 = 3 × 167. It is: * the sum of the first 18 primes (a term of the sequence ). * palindromic in bases 9 (6169) and 20 (15120). 502 * 502 = 2 × 251 * vertically symmetric number 503 503 is: * a prime number. * a safe prime. * the sum of three consecutive primes (163 + 167 + 173). * the sum of the ...
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