50th Anniv. My Lai Massacre: Heroes were High Thompson and Flight Crew
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Twenty-six soldiers were charged with criminal offenses, but only Lieutenant William Calley Jr., a platoon leader in C Company, was convicted.
Found guilty of killing 22 villagers, he was originally given a life sentence,
but served only three and a half years under house arrest
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Wikipedia details
https://en.m.wikipedia.org/wiki/My_Lai_Massacre
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Initially, three U.S. servicemen who had tried to halt the massacre and rescue the hiding civilians were shunned, and even denounced as traitors by several U.S. Congressmen, including Mendel Rivers, Chairman of the House Armed Services Committee. Only after thirty years were they recognized and decorated, one posthumously, by the U.S. Army for shielding non-combatants from harm in a war zone. Along with the No Gun Ri massacre in Korea eighteen years earlier, Mỹ Lai was one of the largest single massacres of civilians by U.S. forces in the 20th century.