1st Battalion, 503rd Infantry Regiment

1st Battalion, 503rd Infantry Regiment
Coat of arms
Active	1941–45 1951–84 1986–2005 2006–present
Country	United States
Branch	United States Army
Type	Infantry
Role	Airborne
Size	Battalion
Part of	173rd Airborne Brigade Combat Team
Nickname(s)	First Rock
Engagements	World War II Vietnam War Operation Enduring Freedom Operation Iraqi Freedom
Commanders
Battalion Commander	LTC Joe Branch
Command Sergeant Major	CSM Bryan O'Neal
Insignia
Distinctive unit insignia
Beret flash

The 1st Battalion, 503rd Infantry Regiment (1–503rd IR) is an active duty airborne infantry battalion in the United States Army, assigned to the 173rd Airborne Brigade Combat Team and stationed in Vicenza, Italy. The battalion has served with the 2nd Infantry Division, the 11th Airborne Division, the 24th Infantry Division, the 82nd Airborne Division, and the 173rd Airborne Brigade; has been stationed in Korea, Italy and the United States; and earned campaign credits in World War II, the Vietnam War, Operation Enduring Freedom-Afghanistan, and Operation Iraqi Freedom.