 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.