Eugene, an aspiring writer from Brooklyn, is drafted into the US Army during the final months of World War II. For his basic training, the Army sends him to Camp Shelby in Mississippi, where toil, bad food, and antisemitic jibes await. Eugene takes refuge in his sense of humor and in his diary, but they won't protect him in a battle of wills with an unstable drill sergeant.

In 1897, little Priscilla Williams, along with her widowed mother, goes to live with her army colonel paternal grandfather on the British outpost he commands in northern India.

U.S. Marine Sergeant O'Hara has his hands full training raw recruits, one of whom, 'Skeets' Burns, is a particular thorn in his side. If Burns's lackadaisical approach to the military were not bad enough, he also makes advances on nurse Nora Dale, whom Sergeant O'Hara secretly loves. Nora is oblivious to O'Hara's feelings and is attracted to the handsome 'Skeet.' But an indiscretion turns her against him, and it takes an expedition to China and a battle with a warlord's bandit brigade to sort things out among the nurse and her two Marines.

Bugs Bunny gets a draft notice by mistake and joins the army, with disastrous results, especially for the sergeant of his platoon.