| Designation | Nickname | Primary role |
|---|---|---|
| AT-19 | Reliant | U.S. Air Force Advanced Trainer (1924-1948) |
| C-81 | Reliant | U.S. Air Force Transport (1925-1962) |
| C-91 | U.S. Air Force Transport (1925-1962) | |
| CQ | Vigilant | U.S. Air Force Target Control (1942-1947) |
| GQ | Reliant | U.S. Navy / Marines Transport, Single-Engined (1939-1941) |
| L-1 | Vigilant | U.S. Air Force Liaison (1942-1962) |
| L-5 | Sentinel | U.S. Air Force Liaison (1942-1962) |
| L-9 | Voyager | U.S. Air Force Liaison (1942-1962) |
| L-12 | Reliant | U.S. Air Force Liaison (1942-1962) |
| O-49 | Vigilant | U.S. Air Force Observation (1924-1942) |
| O-54 | Voyager | U.S. Air Force Observation (1924-1942) |
| O-62 | Sentinel | U.S. Air Force Observation (1924-1942) |
| R3Q | Reliant | U.S. Navy / Marines Transport (1931-1962) |
| RQ | Reliant | U.S. Navy / Marines Transport (1931-1962) |
| SM-1 | Detroiter | Commercial Transport |
| SR | Reliant | Commercial Transport |
| U-19 | Sentinel | U.S. Air Force Utility (1952- Present) |