Nicholas Goldberg: How two events 50 years ago helped define the 1960s

Fifty years ago, U.S. Army Lt. William Calley was found guilty of committing 22 premeditated murders during a massacre by U.S. forces in the Vietnamese hamlet of My Lai. A platoon leader who had led his soldiers into the undefended village, Calley stood ramrod stiff as he listened to the jury’s verdict in his court martial. Face flushed, he offered a crooked salute after the verdict was read.