The 172nd Infantry Regiment is a combat infantry unit within the United States Army. It belongs to the 86th Infantry Brigade Combat Team, part of the United States Army Reserve. The regiment was initially activated in 1917 during World War I and has since seen service in major conflicts such as World War II, the Vietnam War, the Gulf War, and the War in Afghanistan. The 172nd is known for its role in various significant operations, including the capture of Hill 881A during the Battle of Khe Sanh in Vietnam and the ongoing support to Operation Enduring Freedom. The regiment's motto is "First to Fight," reflecting their history as one of the first U.S. forces deployed during conflicts.