The American Soldier (1970)

Ricky is a cold-blooded U.S. German contract killer. After serving in Viet Nam, he returns to his home town of Munich to eliminate a few problem crooks for three renegade cops. He inspects his old neighborhood with his childhood accomplice Franz Walsch, and pays a short visit to his mother and doting brother. When Ricky asks the hotel clerk for a girl, one of the cops sends his girlfriend Rosa. However, she falls for the killer.