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VIETNAM KRIEG SAIGON HINRICHTUNG (1/14)

South Vietnamese forces escort suspected Viet Cong officer Nguyen Van Lem (also known as Bay Lop) on a Saigon street Feb. 1, 1968, early in the Tet Offensive. Moments later, Lem was executed by Gen. Nguyen Ngoc Loan, chief of the national police. (AP Photo/Eddie Adams)

VIETNAM KRIEG SAIGON HINRICHTUNG (2/14)

South Vietnamese forces escort suspected Viet Cong officer Nguyen Van Lem (also known as Bay Lop) on a Saigon street Feb. 1, 1968, early in the Tet Offensive. Moments later, Lem was executed by Gen. Nguyen Ngoc Loan, chief of the national police. (AP Photo/Eddie Adams)

VIETNAM KRIEG SAIGON HINRICHTUNG (3/14)

South Vietnamese forces escort suspected Viet Cong officer Nguyen Van Lem (also known as Bay Lop) on a Saigon street Feb. 1, 1968, early in the Tet Offensive. Moments later, Lem was executed by Gen. Nguyen Ngoc Loan, chief of the national police. (AP Photo/Eddie Adams)

VIETNAM KRIEG SAIGON HINRICHTUNG (4/14)

South Vietnamese forces escort suspected Viet Cong officer Nguyen Van Lem (also known as Bay Lop) on a Saigon street Feb. 1, 1968, early in the Tet Offensive. Moments later, Lem was executed by Gen. Nguyen Ngoc Loan, chief of the national police. (AP Photo/Eddie Adams)

VIETNAM KRIEG SAIGON HINRICHTUNG (5/14)

South Vietnamese forces escort suspected Viet Cong officer Nguyen Van Lem (also known as Bay Lop) on a Saigon street Feb. 1, 1968, early in the Tet Offensive. Moments later, Lem was executed by Gen. Nguyen Ngoc Loan, chief of the national police. (AP Photo/Eddie Adams)

VIETNAM KRIEG SAIGON HINRICHTUNG (6/14)

South Vietnamese forces escort suspected Viet Cong officer Nguyen Van Lem (also known as Bay Lop) on a Saigon street Feb. 1, 1968, early in the Tet Offensive. Moments later, Lem was executed by Gen. Nguyen Ngoc Loan, chief of the national police. (AP Photo/Eddie Adams)

VIETNAM KRIEG SAIGON HINRICHTUNG (7/14)

South Vietnamese forces escort suspected Viet Cong officer Nguyen Van Lem (also known as Bay Lop) on a Saigon street Feb. 1, 1968, early in the Tet Offensive. Moments later, Lem was executed by Gen. Nguyen Ngoc Loan, chief of the national police. (AP Photo/Eddie Adams)

VIETNAM KRIEG SAIGON HINRICHTUNG (8/14)

South Vietnamese forces escort suspected Viet Cong officer Nguyen Van Lem (also known as Bay Lop) on a Saigon street Feb. 1, 1968, early in the Tet Offensive. Moments later, Lem was executed by Gen. Nguyen Ngoc Loan, chief of the national police. (AP Photo/Eddie Adams)

VIETNAM KRIEG SAIGON HINRICHTUNG (9/14)

AP photographer Eddie Adams won the Pulitzer Prize for this photo of South Vietnam's national police chief executing a Viet Cong officer in 1968. The photo has been credited with turning public opinion against the war. (AP Photo/Eddie Adams) - Additional information: SOUTH VIETNAMESE NATIONAL POLICE CHIEF BRIG GEN. NGUYEN NGOC LOAN EXECUTES A VIET CONG OFFICER WITH A SINGLE PISTOL SHOT IN THE HEAD IN SAIGON, VIETNAM ON FEB. 1, 1968. CARRYING A PISTOL AND WEARING CIVILIAN CLOTHES, THE VIET CONG GUERRILLA WAS CAPTURED NEAR QUANG PAGODA, IDENTIFIED AS AN OFFICER AND TAKEN TO THE POLICE CHIEF. VIETNAM WAS DIVIDED INTO THE COMMUNIST-RULED NORTH, AND THE SOUTH, SUPPORTED BY THE US AFTER HO CHI MINH ENDED FRENCH COLONIAL RULE IN 1954.

VIETNAM KRIEG SAIGON HINRICHTUNG (9/14)

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 Feb. 1, 1968, early in the Tet Offensive. (AP Photo/Eddie Adams)

VIETNAM KRIEG SAIGON HINRICHTUNG (10/14)

South Vietnamese Gen. Nguyen Ngoc Loan, chief of the national police, holsters his gun after executing suspected Viet Cong officer Nguyen Van Lem (also known as Bay Lop) whose body lies on a Saigon street Feb. 1, 1968, early in the Tet Offensive. (AP Photo/Eddie Adams)

VIETNAM KRIEG SAIGON HINRICHTUNG (11/14)

South Vietnamese Gen. Nguyen Ngoc Loan, right, chief of the national police, walks past the body of suspected Viet Cong officer Nguyen Van Lem (also known as Bay Lop) after executing Lem on a Saigon street Feb. 1, 1968, early in the Tet Offensive. (AP Photo/Eddie Adams)

VIETNAM KRIEG SAIGON HINRICHTUNG (12/14)

The body of suspected Viet Cong officer Nguyen Van Lem (also known as Bay Lop) lies on a Saigon street Feb. 1, 1968, early in the Tet Offensive, after Lem was executed by South Vietnamese Gen. Nguyen Ngoc Loan, chief of the national police. (AP Photo/Eddie Adams)

VIETNAM KRIEG SAIGON HINRICHTUNG (13/14)

The body of suspected Viet Cong officer Nguyen Van Lem (also known as Bay Lop) lies on a Saigon street Feb. 1, 1968, early in the Tet Offensive, after Lem was executed by South Vietnamese Gen. Nguyen Ngoc Loan, chief of the national police. (AP Photo/Eddie Adams)

VIETNAM KRIEG SAIGON HINRICHTUNG (14/14)

South Vietnamese troops look over the body of suspected Viet Cong officer Nguyen Van Lem (also known as Bay Lop) on a Saigon street Feb. 1, 1968, early in the Tet Offensive, after Lem was executed by South Vietnamese Gen. Nguyen Ngoc Loan, chief of the national police. (AP Photo/Eddie Adams)