520th (Kent And Sussex) Coast Regiment, Royal Artillery
520th may refer to: * 520th Air Defense Group, disbanded United States Air Force organization * 520th Fighter-Interceptor Squadron, inactive United States Air Force unit See also * 520 (number) * 520 (other) * 520, the year 520 (DXX) of the Julian calendar *520 BC The year 520 BC was a year of the Roman calendar, pre-Julian Roman calendar. In the Roman Empire, it was known as year 234 '' Ab urbe condita''. The denomination 520 BC for this year has been used since the early medieval period, when the Anno D ...

520th Air Defense Group
The 520th Air Defense Group is a disbanded United States Air Force organization. Its last assignment was with the 4706th Air Defense Wing at Truax Field, Wisconsin, where it was inactivated in 1955. The group was originally activated as a support unit for the 340th 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 327th Fighter Group in a project that replaced air defense groups commanding fighter squadrons with fighter groups with distinguished records during World War II. History World War II The group was first activated during World War II in Italy in late 1944 as the 520th Air Service Group as part ...
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520th Fighter-Interceptor Squadron
The 520th Fighter-Interceptor Squadron is an inactive United States Air Force unit. Its last assignment was with 530th Air Defense Group, stationed at Geiger Field, Washington, where it was inactivated on 18 August 1955. The squadron was first activated during World War II as the 638th Bombardment Squadron, a dive bomber unit, but was disbanded before participating in combat in a general reorganization of Army Air Forces training units. It was reconstituted during the Cold War as a fighter interceptor unit supporting the air defense of the United States. History World War II The squadron was activated in April 1943 as the 638th Bombardment Squadron at Key Field, Mississippi, as one of the original squadrons of the 408th Bombardment Group.Maurer, ''Combat Squadrons'', p. 624Maurer, ''Combat Units'', p. 294 In August, along with several other Army Air Forces (AAF) single engine dive bomber units, it became a fighter-bomber unit, and was designated as the 520th Fighter-Bombe ...
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520 (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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520 (other)
520 may refer to: * 520 AD, a Gregorian calendar year * 520 BC, a pre-Gregorian calendar year * Area code 520 * 520 (number) Astronomy * 520 Franziska, an asteroid * Abell 520, a galaxy cluster * Kosmos 520, a Soviet satellite * NGC 520, a pair of colliding spiral galaxy Buildings * 520 Park Avenue, New York City, New York, United States * 520 West 28th Street, New York City, New York, United States * 520 West 41st Street, New York City, New York, United States * 520 West End Avenue, New York City, New York, United States Electronics * HP 520 Notebook, a business laptop * Lenovo IdeaPad 520, a discontinued brand of notebook computers * Nokia Lumia 520, an entry-level smartphone * Nokia Talkman 520, a portable phone Literature * Minuscule 520, a Greek minuscule manuscript Military * No. 520 Squadron RAF, a meteorological squadron of the Royal Air Force * United Nations Security Council Resolution 520 Equipment and vehicles * Stevens Model 520, a pump-action shotgun * U ...
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