This is the most famous picture of a viet cong ever taken.
http://en.wikipedia.org/wiki/Nguyen_Ngoc_Loan
"General Nguyễn Ngọc Loan (December 11, 1930[1]–July 14, 1998) was the Republic of Vietnam's Chief of National Police. Loan gained international infamy when he executed Nguyễn Văn Lém, a Viet Cong prisoner, on February 1, 1968 in front of Vo Suu, an NBC cameraman, and Eddie Adams, an Associated Press photographer. The photo (captioned "General Nguyen Ngoc Loan executing a Viet Cong prisoner in Saigon") and film would become two of the most famous images in journalism and started to change the American public's views on the Vietnam War."