122 (Warwickshire Regiment) Light Anti-Aircraft Regiment RA(TA) was converted in February 1942 from 45 Searchlight Regiment. The Regiment was re-designated 122 Light Anti-Aircraft/Anti-Tank Regiment in January 1944. It was re-constituted as 580 (The Royal Warwickshire Regiment) Heavy Anti-Aircraft Regiment RA(TA) in January 1947.
| Feb 42 | Formed from 45 Searchlight Regiment | |
| Feb 42 | Home Forces | UK |
| Jun 43 | 7 Indian Division | India |
| Aug 43 | 36 Indian Division | India |
| Jan 44 | Became 122 Light Anti-Aircraft/Anti-Tank Regiment 2 batteries to 100 Light Anti-Aircraft/Anti-Tank Regiment |
Batteries
| Feb 42 | 400, 401, 402, 403 |
| Sep 42 | 400, 401, 402 |
| Nov 43 | 400, 401, 402, X |
