The VT designation was one of the original designations. It was established in 1921 to designate "Torpedo Plane Squadron". From 1922 to 1930 it designated "Torpedo & Bombing Squadron" and from 1930 to 1946 "Torpedo Squadron". In 1946 all remaining Torpedo Squadrons and Bombing Squadrons (VB) were redesignated "Attack Squadrons" (VA) and the VT designation was retired.
From 1927 to 1947 training squadrons were designated "VN". From 1947 to 1960 training units were not designated as squadrons, they were "units" or "groups" called Basic Training Groups (BTG), Advanced Training Units (ATU), Jet Transition Training Units (JTTU) or Multi Engine Training Groups (METG). On 1 May 1960 the VT designation was resurrected and existing flying training units were designated "Training Squadrons (VT)"
Training Squadrons
| VT- Squadrons | |
| VT-1 | 1960 - 1976 |
| VT-2 | 1960 - today |
| VT-3 | 1960 - today |
| VT-4 | 1960 - today |
| VT-5 | 1960 - 1976 |
| VT-6 | 1960 - today |
| VT-7 | 1960 - today |
| VT-9 1st | 1961 - 1987 |
| VT-9 2nd | 1988 - today |
| VT-10 | 1960 - today |
| VT-19 | 1971 - 1988 |
| VT-21 | 1960 - today |
| VT-22 | 1960 - today |
| VT-23 | 1960 - today |
| VT-24 | 1960 - 1992 |
| VT-25 | 1960 - 1992 |
| VT-26 | 1960 - 1992 |
| VT-27 | 1960 - today |
| VT-28 | 1960 - today |
| VT-29 | 1960 - 1976 |
| VT-30 | 1960 - 1966 |
| VT-31 | 1960 - today |
| VT-35 | 19?? - today |
| VT-86 | 1977 - today |
| BTG- Squadrons | |
| BTG-2 | 19?? - 1960 |
| BTG-3 | 19?? - 1960 |
| BTG-7 | 1958 - 1960 |
| BTG-9 | 19?? - 1960 |
.
| ATU- Squadrons | |
| ATU-3 | 1951 - 19?? |
| ATU-6 | 1949 - 1949 |
| ATU-6 | 1951 - 1952 |
| ATU-105 | 19 |
| ATU-200 | 19?? - 19?? |
| ATU-201 | 1954 - 1958 |
| ATU-202 | 1951 - 1960 |
| ATU-203 | 19?? - 1960 |
| ATU-205 | 19 |
| ATU-206 | 1955 - 1958 |
| ATU-212 | 19?? - 1960 |
| ATU-213 | 19?? - 1960 |
| ATU-222 | 1958 - 1960 |
| ATU-301 | 19?? - 1960 |
| ATU-400 | 1952 - 1952 |
| ATU-402 | 1952 - 1960 |
| ATU-501 | 19?? - 1960 |
| ATU-601 | 19?? - 1960 |
| ATU-800 | 19 |
| ATU-801 | 19 |
| Special Training Units | |
| FAETULant | ... |
| FAETUPac | ... |
| FAWTUlant | ... |
| FAWTUPac | 1948 - 1958 |
| SWULant | ... |
| FAGU | ... |
| HATU | ... |
| HATULant | ... |
| HATUPac | ... |
| Naval Air Technical Training Units | |
| NATTU Glynco | 1948 - 1972 |
| NATTU Lakehurst | 19?? - 1966 |
| NATTU Memphis | 19?? - 1975 |
| NATTU Pensacola | 19?? - 1972 |
| NATTU Philadelpia | 19?? - 1970 |
