Verboten!

Verboten is a 1959 film written, produced and directed by Samuel Fuller. It was the last film of the influential but troubled RKO studio, which coproduced it with Fullers own Globe Enterprises. It was filmed at the RKO Forty Acres backlot. Distribution was handled by Columbia Pictures.

Near the end of World War II in Europe, American soldier Sergeant David Brent James Best loses two men and is himself wounded while hunting down and killing a sniper in a German city. He falls unconscious in front of a young German woman, Helga Schiller Susan Cummings. When he awakes, he finds that she has tended his wound rather than killing him. She also protects him from her bitter younger brother, Franz Harold Daye. When the SS set up an artillery observation post in Helgas building, she hides David to prove she is not a Nazi. Later, the Americans capture the city, and David is sent to a hospital.After Germany surrenders, David returns to the city and marries Helga, despite being warned by his commanding officer. Because American soldiers are verboten forbidden to fraternize with German women, he resigns from the Army and goes to work in the Food Office of the Military Government. ........

Source: Wikipedia