The Private War of Major Benson (1955) Charlton Heston, Julie Adams, William Demarest

A Major noted for advancing with his mouth before thinking is given a choice: to be drummed out of the Army, or take command of and shape up the ROTC program at Sheridan Academy before it fails its next inspection. At Sheridan he encounters three hundred preteen cadets who range from rascally to adorable, and a female doctor who has just the right prescription for him.