The 1st Infantry Regiment is a regiment of the United States Army that draws its lineage from a line of post American Revolutionary War units and is credited with thirty-nine campaign streamers. The 1st Battalion, 1st Infantry is assigned as support to the United States Military Academy at West Point, New York and to furnish the enlisted garrison for the academy and the Stewart Army Subpost. 2nd Battalion, 1st Infantry Regiment is an infantry component serving with the 2nd Stryker Brigade, 2nd Infantry Division at Joint Base Lewis–McChord, Washington.

The 2nd Infantry Division ("Indianhead") is a formation of the United States Army. Since the 1960s, its current primary mission is the pre-emptive defense of South Korea in the event of an invasion from North Korea. There are approximately 17,000 soldiers in the 2nd Infantry Division, with 10,000 of them stationed in South Korea, accounting for about 35% of the United States Forces Korea personnel. Denoted the 2nd Infantry Division-ROK/U.S. Combined Division (2ID/RUCD), the division is augmented by rotational Brigade Combat Teams (BCTs) from other U.S. Army divisions.