14 March 1941 Constituted in the Army of the United States as the 504th Parachute Battalion

05 October 1941 Activated at Fort Benning, Georgia

24 February 1942 Reorganized and redesignated as the 2d Battalion, 503d Parachute Infantry

02 November 1942 Reorganized and redesignated as the 2d Battalion, 509th Parachute Infantry

10 December 1943 Reorganized and redesignated as the 509th Parachute Infantry Battalion

World War II:

        Algeria-French Morocco (with arrowhead)

        Tunisia (with arrowhead)

        Naples-Foggia (with arrowhead)

        Anzio (with arrowhead)

        Rome-Arno

        Southern France (with arrowhead)

        Rhineland

Presidential Unit Citation (Army) for LIEGE, BELGIUM

Presidential Unit Citation (Army) for CARANO, ITALY

Presidential Unit Citation (Army) for CARANO, ITALY - MARCH 1944 - Awarded to C CO 509th PIB only

French Croix de Guerre with Silver Star, World War II for MUY EN PROVENCE

Cited in the Order of the Day of the Belgian Army for action in the ARDENNES

Cited in the Order of the Day of the Belgian Army for action at ST. VITH