503d Infantry Regiment
Overview
 
The 503rd Infantry Regiment, formerly the 503rd Parachute Infantry Regiment (PIR) is an airborne
Airborne forces
Airborne forces are military units, usually light infantry, set up to be moved by aircraft and 'dropped' into battle. Thus they can be placed behind enemy lines, and have an ability to deploy almost anywhere with little warning...

 unit in the United States military. It is one of the most decorated units of its kind with a distinguished battlefield record notably in World War II
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

 and the Vietnam War
Vietnam War
The Vietnam War was a Cold War-era military conflict that occurred in Vietnam, Laos, and Cambodia from 1 November 1955 to the fall of Saigon on 30 April 1975. This war followed the First Indochina War and was fought between North Vietnam, supported by its communist allies, and the government of...

. It is part of 173rd Airborne Brigade Combat Team.
On February 14, 1942, the 503rd Parachute Infantry Regiment was formed.

The Regiment's 1st and 2nd Battalions were formed at Fort Benning, Georgia, from the 503rd and 504th Parachute Battalions, respectively.
 
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