| Abbreviation | Definition |
|---|---|
| OTA2 | ean Systems Technician (automatic) Petty Officer 2nd Class |
| OTA2 | Ocean Systems Technician (automatic) Petty Officer 2nd Class |
| OTA3 | ean Systems Technician (automatic) Petty Officer 3rd Class |
| OTA3 | Ocean Systems Technician (automatic) Petty Officer 3rd Class |
| OTAC | ean Systems Technician (automatice) Chief Petty Officer |
| OTAC | Ocean Systems Technician (automatice) Chief Petty Officer |
| OTAC | Oceanographic systems technician analyst Chief Petty Officer |
| OTACS | ean Systems Technician (automatic) Senior Chief Petty Officer |
| OTACS | Ocean Systems Technician (automatic) Senior Chief Petty Officer |
| OTASA | ean Systems Technician (automatic) Seaman Apprentice |
| OTASA | Ocean Systems Technician (automatic) Seaman Apprentice |
| OTASN | ean Systems Technician (automatic) Seaman |
| OTASN | Ocean Systems Technician (automatic) Seaman |
| OTASR | ean Systems Technician (automatic) Seaman Recruit |
| OTASR | Ocean Systems Technician (automatic) Seaman Recruit |
| OTC | ean Systems Technician Chief Petty Officer |
| OTC | Ocean Systems Technician Chief Petty Officer |
| OTCM | cean Systems Technician Master Chief Petty Officer |
| OTCM | Ocean Systems Technician Master Chief Petty Officer |
| OTCS | ean Systems Technician Senior Chief Petty Officer |