The
506th Infantry Regiment, originally designated the
506th Parachute Infantry Regiment (506th PIR) during
World War II, is an
infantry regiment of the
United States Army. Currently a parent regiment under the
U.S. Army Regimental System, the regiment has two active battalions: the 1st Battalion, 506th Infantry Regiment (1-506th) is assigned to the
1st Brigade Combat Team, 101st Airborne Division, and the 2nd Battalion, 506th Infantry Regiment (2-506th) is assigned to the
3rd Brigade Combat Team, 101st Airborne Division.
The regiment served with the
101st Airborne Division in
World War II. Regimental elements have served with the 101st in
Vietnam,
Iraq, and
Afghanistan. Regimental elements have also served in peacetime with the
2nd Infantry Division, and deployed to
Operation Iraqi Freedom The regiment's
Company E ("Easy Company") actions during World War II were featured in the 2001
HBO miniseries
Band of Brothers.