The Last Reunion (movie, 1980)

Several members of a platoon of American soldiers not only kill a Japanese general, but also rape and murder the man's wife. The couple's son, Kimon, witnesses these ghastly events and vows revenge. Thirty-three years later the platoon get back together in Manila for a reunion. The adult Kimon also shows up to pick off the platoon members who are responsible for butchering his parents.