Mr. Winkle Goes to War

Mr. Winkle Goes to War is a 1944 war comedy film starring Edward G. Robinson and Ruth Warrick, based on a novel by Theodore Pratt.

Winkle and his unit are shipped out to the fighting in the Pacific. He and Tinker are sent to repair a bulldozer. Then, the Japanese attack his unit. While Winkle fixes the bulldozer, Tinker looks for revenge. After shooting an enemy soldier, Tinker starts celebrating, only to be killed himself. Winkle uses the bulldozer to knock out a machine gun nest. He is discharged and sent home to recuperate from his wounds. The war hero returns to an enthusiastic welcome from his entire hometown and in particular from Amy and Barry, who show him a new shortcut they have made together to his repair shop.

Source: Wikipedia