Take the High Ground!

Take the High Ground is a film about the Korean War, starring Richard Widmark and Karl Malden as drill instructors who must transform a batch of everyday civilians into soldiers. The film was directed by Richard Brooks.

One night, the men cross the border to Mexico for recreation. In a bar, Ryan and Holt see a beautiful woman, Julie Mollison Elaine Stewart, buying drinks for a group of soldiers. Later that evening, the two sergeants escort the inebriated Julie to her apartment, and Ryan finds himself drawn to her.Training begins. Ryan exposes his men to tear gas to prepare them for the harsh conditions of battle. Ryan and Holt return to the bar one night, and find Julie sitting alone. When the crude Sgt. Vince Opperman Bert Freed insults Julie, she runs out of the bar in tears, and Holt comforts her. Ryan and Opperman fight, and Opperman reveals that Julie was married to a soldier who was killed in Korea shortly after she left him. ........

Source: Wikipedia