Which of these Vietnam war films was not directed by Oliver Stone?

William Oliver Stone (born September 15, 1946) is an American screenwriter, film director, and producer. Stone won an Academy Award for Best Adapted Screenplay as writer of Midnight Express (1978). He also wrote the acclaimed gangster movie Scarface (1983). As a director, Stone achieved prominence as director/writer of the war drama Platoon (1986), for which Stone won the Academy Award for Best Director; the film was awarded Best Picture. Platoon was the first in a trilogy of films based on the Vietnam War, in which Stone served as an infantry soldier. He continued the series with Born on the Fourth of July (1989)—for which Stone won his second Best Director Oscar—and Heaven & Earth (1993). Stone's other notable works include the Salvadoran Civil War-based drama Salvador (1986); the financial drama Wall Street (1987) and its 2010 sequel Money Never Sleeps; the Jim Morrison biopic The Doors (1991); and a trilogy of films based on the American Presidency—JFK (1991), Nixon (1995) and W. (2008). His latest film is Snowden (2016).

Many of Stone's films focus on controversial American political issues during the late 20th century, and as such were considered contentious at the times of their releases. They often combine different camera and film formats within a single scene, as evidenced in JFK, Natural Born Killers, and Nixon.