503rd Infantry Regiment (United States)

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503rd Parachute Infantry Regiment 503rd Airborne Infantry Regiment 503rd Infantry Regiment
Coat of arms
Active	1941–1945 1951–1984 1986–present
Country	United States
Branch	United States Army
Type	Airborne forces
Role	Parachute infantry
Size	Regiment
Nickname(s)	The Rock
Engagements	World War II Vietnam War Afghanistan Operation Iraqi Freedom
Decorations	Presidential Unit Citation
Commanders
Notable commanders	George M. Jones
Insignia
Distinctive unit insignia
Unit flash of 1st Battalion
Unit flash of 2nd Battalion

The 503rd Infantry Regiment, formerly the 503rd Parachute Infantry Regiment (503rd PIR) and the 503rd Airborne Infantry Regiment (503rd AIR), is an airborne infantry regiment of the United States Army. The regiment served as an independent regiment in the Pacific War during World War II; at Fort Campbell, Kentucky; in Okinawa, Japan; and in Germany. Regimental elements have been assigned to the 2nd Infantry Division, the 11th Airborne Division, the 24th Infantry Division, 25th Infantry Division, the 82nd Airborne Division, 101st Airborne Division, and the 173rd Airborne Brigade Combat Team. Regimental elements have participated in campaigns in the Vietnam War, Operation Enduring Freedom–Afghanistan, and Operation Iraqi Freedom. The regiment claims 15 Medal of Honor recipients: two from World War II, ten from Vietnam, and three from Afghanistan. A parent regiment under the U.S. Army Regimental System. The regiment's 1st and 2nd Battalions are active, assigned to the 173rd Airborne Brigade, based at Caserma Ederle, Vicenza, Italy. The 3rd and 4th Battalions as well as Companies E, F, G, H, and I have been inactived.