503d Aviation Lineage Constituted 1 October 1957 in Regular Army as the 503d Aviation Company, assigned to the 3d Armored
Division, and activated in Europe Reorganized and redesignated 1 September 1963 as Headquarters and Headquarters Company,
503d Aviation Battalion (organic elements constituted 21 June 1963 and activated) (Company A inactivated 15 January 1967 in
Europe) Battalion (less Company A) inactivated 5 June 1967 in Europe Headquarters and Headquarters Company redesignated 21
November 1972 as Aviation Company, 3d Armored Division Reorganized and redesignated 21 September 1978 as Headquarters
and Headquarters Company, 503d Aviation Battalion (Companies A and B concurrently activated; 334th Aviation Company
[organized 10 November 1966 in Vietnam] concurrently reorganized and redesignated as Company C) inactivated 16 July 1987
in Germany.