Viet Nam War

An armored personnel carrier of 2nd squad, 11th armored cavalry plows through monsoon mud at firebase warrior 25 miles northwest of Saigon in Vietnam on Sept. 18, 1971. The cavalry conducts defensive operations and monitors enemy infiltration routes from Cambodia to Saigon. (AP Photo)

Soldiers of the 11th Armored Cavalry’s 2nd Squadron slog through monsoon mud near Fire Support Base Warrior 25 miles northwest of Saigon on Sept. 18, 1971. (AP Photo)

AP Photo