Go Tell the Spartans

Go Tell the Spartans is a 1978 American war film directed by Ted Post, from a screenplay by Wendell Mayes, and starring Burt Lancaster, Craig Wasson, Marc Singer and Jonathan Goldsmith. The film is based on Daniel Ford's 1967 novel Incident at Muc Wa about U.S. Army military advisors during the early part of the Vietnam War in 1964, when Ford was a correspondent in Vietnam for The Nation.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.