United States 1st Cavalry, Vietnam War

United States 1st Cavalry soldiers huddle beneath sheeting as a group of three soldiers stand and crouch before the ruins of a building during a rest break in Qui Nhon, South Vietnam, 5th January 1967. The objective of their mission, which was known as Operation Thayer II, was to eliminate PAVN and VC influence in Binh Dinh Province on the central coast of South Vietnam. (Photo by Bettmann Archive/Getty Images)