What Price Glory (movie, 1952)

Two military men, Captain Flagg and Sergeant Quirt, who are rivals to begin with, grow more at odds with each other when Quirt is made Flagg's top sergeant. And when a local beauty comes between them, their rivalry escalates even further. But when they discover that the woman has marriage in mind, they now compete to try to avoid marching down the aisle - that is, until they are called upon to march into battle.