As Harry James and His Music Makers serenade a nightclub audience to the tune of "You Made Me Love You," Sergeant "Muggsy" Shavel arrives with his fiancée, Bonnie-Belle Schlopkiss. Although Muggsy pleads with Bonnie-Belle to go "to the park" instead, especially after he ascertains the high prices of the establishment, she insists on staying. Backstage, Harry learns that he has been drafted, much to the chagrin of singer Lon Prentice, who has been rejected by the U.S. Army for his "flat foot." After bribing the headwaiter, Muggsy and Bonnie-Belle finally get a table, but it is next to the kitchen. Undaunted, the couple moves their table to the front of the dance floor, where Bonnie-Belle immediately attracts the attention of nightclub performer Lancelot Pringle "Biff" McBiff. While Muggsy is infuriated by Biff's brazen advances, Bonnie-Belle welcomes them, particularly when she learns that Muggsy hasn't the money to pay for dinner. Later, Lon sees a foot specialist, who corrects his "flat foot," and he joins Harry at the induction center as a volunteer draftee. The entire band also enlists, and they are soon in training at Camp Healy. There Lon is nothing but a problem, as he doesn't feel he needs any "special training" to join the Army, much to the frustration of his sergeant, Muggsy. The new recruit goes to the captain, who decides to let Lon skip any "unnecessary" training in hopes that he will come around on his own. Meanwhile, Biff and the Andrews Sisters have joined the U.S.O., and they come to Camp Healy to entertain the new soldiers. At the dance that night, Tagalong Mason agrees to introduce Lon to her beautiful older sister Joyce, but he is upset to learn that she is the same woman with whom he had fought earlier. Still, Lon is taken with her until he learns that her uncle is Colonel Elias Weatherford, the commander of the base amd later finds her kissing a man, unaware that he is her brother, Lieutenant Howard Mason. In the meantime, the romantic rivalry between Muggsy and Biff over Bonnie-Belle heats up so much that the young woman ends up striking her one-time fiancé with a flower pot. Lon soon becomes the most unpopular man in the camp, and only as his platoon is about to ship out does he realize his mistake. He goes to Colonel Weatherford and asks to stay with his platoon, but the officer tells him that he must learn "respect" before he can become a good soldier. Lon then condenses weeks of training into a few days. Just before the troops ship out, the U.S.O. puts on a big show, featuring Lon, Biff, Harry and the Andrews Sisters. As the soldiers prepare to leave, Joyce confesses her love to Lon, and gives him a bracelet bearing the inscription, "Hands Off. This Guy Belongs to Me. Joyce." The soldier then leaves to join his comrades in the war, as the Andrews Sisters sing "We've Got a Job to Do."