Sergeant Ryker 1968
It's a US drama war film.
Starred: Bradford Dillman, Peter Graves, Vera Miles, Lloyd Nolan, and Lee Marvin.
During the Korean War Sergeant Paul Ryker is accused of defecting to Communist China and then returning to his unit as a spy. He's court-martialed and sentenced to death but his attorney believes Ryker's innocent and asks for a new trial.