South Vietnamese Chief of National Police, General Nguyen Ngoc Loan, executes a Viet Cong officer with a single pistol shot in the head in Saigon Feb. 1, 1968. Carrying a pistol and wearing civilian clothes, the Viet Cong guerrilla was captured near Quang Pafgoda, identified as an officer and taken to the police chief. (AP Photo/Eddie Adams)