Everybody's heard of the My Lai massacre — March 16, 1968, 50 years ago today — but not many know about the man who stopped it: Hugh Thompson, an Army helicopter pilot. When he arrived, American soldiers had already killed 504 Vietnamese civilians (that's the Vietnamese count; the U.S. Army said 347). They were going to kill more, but they didn't — because of what Thompson did. I met Thompson in 2000 and interviewed him for my radio program on KPFK in Los Angeles. He told the story of what happened that day, when he and his two-man crew flew over My Lai, in support of troops who were looking for Viet Cong fighters.

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