The Girl He Left Behind

Privileged college student Andy Shaeffer is a mama's boy who flunks out of school and is drafted by the army where he becomes a real man, to the astonishment of everyone.
A young man is drafted and goes through the rigors of basic training, ultimately discovering the experience is also character-building. Director David Butler's 1956 film stars '50s teen favorites Tab Hunter and Natalie Wood, with supporting roles played by Jim Backus, Jessie Royce Landis, Murray Hamilton, Henry Jones, James Garner, Alan King, Ernestine Wade, David Janssen and Raymond Bailey.