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No, he wasn't.
Abrams was the last.
South Vietnam was considered an ally of the US.
General William Westmoreland was .
NVA Gen. Giap was the supreme commander.
General William Westmoreland
South Vietnam
Ngo Dinh Diem was the leader of South Vietnam until he was assassinated in November of 1963
USA lost to north Vietnam not south. The south was their ally.
Northern army.
South (RVN-Republic of South Vietnam)
Commander in Chief: President of the US (LBJ).