CAMBODIA U.S. ARMORED TANK

Soldiers of the U.S. 11th Armored Cavalry Regiment are silhouetted atop their tank by the glare of tracer bullets in Cambodia, July 6, 1970. In an exercise known as Mad Minute, they spray the area around them, possibly infiltrated by enemy patrols, before they move on. (AP Photo/Henri Huet)

M113 crewmen of the 11th Armored Cav in Cambodia on the night of July 6, 1970, are silhouetted in the glare of tracer bullets during a “mad minute” exercise, in which they spray the area around them to detect enemy infiltration before moving on.

AP Photo/Henri Huet