Concerned that her engagement as a singer at the Flamingo nightclub is not attracting enough customers, New York debutante Diane Jordan informs the club's press agent that she intends to generate some publicity by enlisting in an Army volunteer group, work diligently for a week or two and then have the Flamingo request her return to sing for morale boosting, patriotic reasons. When gossip columnist Wally Lundigan discovers that Diane is enlisting, along with Susan Slattery, the Club's scatterbrained hat check girl, in the Women's Ambulance and Defense Corps of America, he sees it for the publicity stunt it is and bets Diane $5,000 that she cannot last six weeks in the Corps. Later, at Camp Rhodes, Captain Steve Russell, who with Sergeant Hannah Winters is in charge of the W.A.D.C.A. training, tells Diane that she should expect no special consideration. After they are sworn in, Hannah reminds all the recruits that they are soldiers just as much as their husbands, sons and sweethearts. While receiving instruction on how to extinguish an incendiary bomb and care for wounded soldiers, Diane tries to get to know Steve but her plans backfire. One day, when Diane is assigned to the camp's telephone switchboard, she has to find Steve to take an urgent call from the War Department and mistakenly bursts in on Hannah, who is obviously in distress and taking pills. Later, one Sunday, Diane sees Steve escorting a young woman and jealously tells him that she is expecting a male visitor. After Steve invites her and her visitor to join them later, Diane phones a local male escort bureau and asks them to send over a romantic young man, dressed as a sailor. When a man in Navy uniform appears, Diane assumes that he is her escort, but he is actually Steve's brother Jim. Diane encourages him to behave very romantically with her and when the couples meet, the brothers go along with the situation for a while. Diane's real escort eventually shows up, however, and her scheme falls apart. Aware that Jim has been assigned to an adjacent supply camp, Diane is nevertheless happy to be escorted by him, although she makes it clear to him that it is Steve who really interests her. With time, Diane becomes more serious about her training and is selected to go to Boston to train recruits there. Later, Wally shows up at the camp to check on his bet and to take some glamour photographs for his column. When he tells Steve about his bet with Diane and that she enlisted for publicity reasons, Steve cancels her Boston assignment. Diane then decides to quit, even though she admits it is the most worthwhile work she has ever done. Susie gets Jim to talk to Steve, who has fallen in love with the debutante, but he fails to see Diane's virtues. As Diane is leaving, Hannah has a heart attack and sends Diane to the dispensary for digitalis. When she returns, she finds the barracks on fire, but is able to rescue Hannah. Hannah recovers and tells Steve that Diane is really a fine girl. Diane decides to stay on and, once her training is over, Steve assigns her to Dutch Harbor, Alaska. When Wally sends her a check for $5,000, acknowledging that he has lost the bet, Diane decides to use the money to buy and equip another ambulance. Initially sad at being assigned so far away from Steve, Diane is overjoyed to discover that he, too, is going to Dutch Harbor, and they embrace.