Found 3 full forms for GMT3
| Term | Full Form | Category |
|---|---|---|
| GMT3 | Gunner's Mate (technician) Petty Officer 3rd Class 
| Others |
| GMT3 | Gunner's Mate (torpedo) 3rd Class Petty Officer
| Others |
| GMT3 | Gunner's Mate (turrets) Petty Officer 3rd Class
| Others |