| Designation | Modified Role | Location | Serial / Regist. |
|---|---|---|---|
| UC-81 | Utility | ||
| UC-81A | Utility | ||
| UC-81B | Utility | ||
| UC-81C | Utility | ||
| XC-81D | |||
| UC-81E | Utility | ||
| UC-81F | Utility | ||
| UC-81G | Utility | ||
| UC-81H | Utility | ||
| UC-81J | Utility | ||
| UC-81K | Utility | ||
| UC-81L | Utility | ||
| UC-81M | Utility | ||
| UC-81N | Utility |