Vietnam War

Logs atop a small bunker provide protection for a U.S. infantryman, a member of the 25th division “Wolfhounds,” as he fires a machine gun at Viet Cong positions near Cu Chi, some 25 miles northwest of Saigon in Vietnam on Feb. 27, 1966. The Americans were expanding the perimeter around their base camp through a heavily-tunneled and entrenched area. (AP Photo)