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What was the only U.S. casualty during the My Lai operation?

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A group of frightened Vietnamese women and children stand close together outdoors during the My Lai Massacre in the Vietnam War. — My Lai Massacre Vietnamese citizens photographed during the My Lai Massacre, March 16, 1968.

During the operation at My Lai on March 16, 1968, there were no combat casualties among U.S. forces. The only U.S. casualty occurred when a soldier accidentally shot himself in the foot while attempting to clear a jammed weapon.1