Combat!: The Celebrity (1962) (TV)

I could not do better than the Internet Movie Database plot summary: "Del Packer, a famous baseball star who was drafted into the army, winds up as a replacement in the squad. While Kelly looks for a way to make some money by setting up a baseball game with a neighboring outfit, Billy--a devoted baseball fan--is awestruck to be in the same squad as one of his heroes. However, Packer has his own demons to fight, and while the other squad members are too star-struck to notice that something may be wrong, Saunders isn't."