Plane Dippy is a 1936 Warner Bros. Looney Tunes cartoon directed by Tex Avery.
He briefly considers the Army's infantry division and the Navy, before deciding to join the Air Corps.
The sergeant (similar to MGM's Spike) sends Porky through a series of tests, which he fails disastrously.
Finally, a number of other children show up and shout constant commands at the puppy, causing the plane to go totally berserk.
Porky goes racing from the building and dashes into the office of the infantry division, proclaiming that he wants to "l-l-learn to m-m-march".