| AKA | Attack Cargo Ship (Auxiiliary, Kargo, Attack) |
| AKC | Coastal Cargo ship (Auxiliary, Kargo, Coastal) |
| AKD | Dock Cargo Ship (Auxiliary, Kargo, Dock) |
| AKL | Light Cargo Ship (Auxiliary, Kargo, Light) |
| AKR | Roll-on/Roll-off Cargo Ship (Auxiliary, Kargo, Roll-on) |
| AKV | Aircraft Ferry (Auxiliary, Kargo, heaVier-than-air aircraft) |
| AM | Minelayer (Auxiliary, Minelayer) |
| AMC | Coastal Minesweeper (Auxiliary, Minesweeper, Coastal) |
| AMS | Minesweeper (Auxiliary, MineSweeper) |
| AN | Netlayer (Auxiliary, Netlayer) |
| ANL | Netlayer ship (Auxiliary, NetLayer) |
| ANOA | Advanced Notice of Arrival |
| AO | Fleet Oiler (Auxiliary, Oiler) |
| AOE | Fast Combat Support Ship (Auxiliary, Oiler, Explosives) |
| AOG | Gasolene Oiler (Auxiliary, Oiler, Gasolene) |
| AOPS | Arctic/Offshore Patrol Ship |
| AOR | Replenishment Oiler (Auxiliary, Oiler, Replenishment) |
| AOT | Transport Oiler (Auxiliary, Oiler, Transport) |
| AP | Transport (Auxiliary, Personnel) |
| APA | Attack Transport (Auxiliary, Personnel, Attack) |