This is the film in which we learn that Donald's middle name is Fauntleroy.
The opening graphic is Donald Duck wearing an army hat instead of his usual sailor hat. This is repeated in the other army-themed Donald Duck cartoons.
Donald's induction notice is dated March 24, 1941, making Donald a peacetime draftee under the September 16, 1940, Selective Training and Service Act, P.L. 76-783, 54 Stat. 885, and prior to the US declaration of war against Japan on December 8, 1941.