I was very interested to learn that the famous photograph of South Vietnamese General Nguyen Ngoc Loan executing a prisoner was not, in fact, what it's long been reported as being. FStoppers reports:
This gruesome photograph [below] became pivotal anti-war propaganda that drastically shaped public opinion. The horrific frozen frame depicts a baptismal moment of unwavering distinction, a moment in a time that could not be undone, an elevated wartime tension that could not be unraveled. In this sense, the photograph was successful. It was shocking and characteristic in its ability to drive the anti war movement, protesting against brutality of the Vietnam conflict. But, what you can't see, is enough to change your perspective completely.
Despite assumable context, the "victim" in the photo, is not a civilian. The man being executed is Viet Cong prisoner Nguyễn Văn Lém (also known as Captain Bay Lop). Van Lem, or Bay Lop, was an assassin, the leader of a VC death squad who was targeting South Vietnamese officials. Early on the morning of the photograph, Bay Lop had led a unit of VC tanks to attack the Armor Camp in Go Vap. After taking control of the camp, Bay Lop arrested Lt.Col Tuan along with his family. In an effort to gain intelligence from Tuan, Bay Lop tortured, and eventually executed, Tuan. Bay Lop then went on to kill all the members of Tuan's family, to include his 80-year-old mother. Captain Bay Lop was then captured near a mass grave of 34 innocent civilian bodies, leaving little doubt to his involvement in the atrocity. Upon proudly admitting his participation in the horrific war crime, Bay Lop was brought in and promptly executed with the .38 side arm in front of AP photographer Eddie Adams.
. . .
While war is violent and horrific, the actions carried out by Gen. Nguyen Ngoc Loan, chief of the national police, were reasonably just. Adams later said in an article in Time, "The general killed the Viet Cong; I killed the general with my camera."
There's much more information at the link. Interesting and highly recommended reading for military history buffs.