In the U. S. Army intelligence office, bumbling lieutenant Peter Stirling receives a coded message from his friend, Francis, a talking mule. The note urges Pete to hurry to the Coronado, California naval base, where Francis is about to be sold as surplus. Pete rushes to the train station, but before he can board, nurse Betsy Donevan mistakes him for her shell-shocked brother, Navy boatswain Slicker Donevan. She tries to forcibly remove his uniform so he will not get into trouble for impersonating an Army officer. Finally she realizes that Pete is not Slicker but merely his mirror image.
Unfortunately the movie Francis in the Navy is not yet available on Disney Plus.
| Art | Alexander Golitzen | Art Direction |
| Writing | Devery Freeman | Story |
| Art | Bill Newberry | Art Direction |
| Directing | Arthur Lubin | Director |
| Writing | Devery Freeman | Screenplay |
| Writing | David Stern | Characters |
| Editing | Milton Carruth | Editor |
| Editing | Ray Snyder | Editor |
| Production | Stanley Rubin | Producer |
| Costume & Make-Up | Joan St. Oegger | Hairstylist |
| Art | Russell A. Gausman | Set Decoration |
| Crew | F.D. Fane | Technical Advisor |
| Crew | Clifford Stine | Special Effects |
| Sound | Leslie I. Carey | Sound |
| Sound | Frank H. Wilkinson | Sound |
| Directing | Phil Bowles | Assistant Director |
| Sound | Joseph Gershenson | Music Supervisor |
| Costume & Make-Up | Bud Westmore | Makeup Artist |
| Camera | Carl E. Guthrie | Director of Photography |
| Art | Ray Jeffers | Set Decoration |
| Camera | Robert Pierce | Assistant Camera |
| Directing | Luanna Sherman | Script Supervisor |
