4 pictures from the vietnam war

in this June 11, 1963 file photo, Quang Duc, a Buddhist monk, burns himself to death on a Saigon street to protest alleged persecution of Buddhists by the South Vietnamese government. (AP Photo/Malcolm Browne)

In this Feb. 1, 1968 file photo, South Vietnamese Gen. Nguyen Ngoc Loan, chief of the national police, fires his pistol into the head of suspected Viet Cong officer Nguyen Van Lem, also known as Bay Lop, on a Saigon street, early in the Tet Offensive. (AP Photo/Eddie Adams)

In this Jan. 9, 1964 file photo, a South Vietnamese soldier uses the end of a dagger to beat a farmer for allegedly supplying government troops with inaccurate information about the movement of Viet Cong guerrillas in a village west of Saigon, Vietnam. (AP Photo/Horst Faas)