FILE - In this June 1967 file photo, medic James E. Callahan of Pittsfield, Mass., looks up while applying mouth-to-mouth resuscitation to a seriously wounded soldier north of Saigon in June 1967. The war ended on April 30, 1975, with the fall of Saigon, now known as Ho Chi Minh City, to communist troops from the north. (AP Photo/Henri Huet, File)