Each November 22nd, representatives of the U.S. Army Special Forces-the Green Berets-join members of the Ken- nedy family at a memorial ceremony at President John F. Ken-nedy's grave. This joint tribute symbolizes the ambiguous legacy of the U.S. venture in Vietnam. Kennedy had personally championed the Green Berets as an elite vanguard combating Communist revolution and subversion in the Third World. But just four years after the President's assassination, his brothers Robert and Edward had moved...