With World War I looming, young U.S. Army doughboy Robert Conroy (Logan Lerman) has his life forever changed when a little dog with a stubby tail wanders into camp, as the men of the 102nd Infantry Regiment (United States), 26th Infantry Division (United States) train on the parade grounds of Yale University. Conroy gives his new friend a name, a family, and a chance to embark on the adventure that would define a century.