102 Anti-Aircraft Regiment RA(TA) was formed at Antrim in August 1939. It was re-designated as 102 Heavy Anti-Aircraft Regiment RA(TA) in June 1940. The Regiment was placed in suspended animation in January 1944 and reconstituted as 502 (Ulster) (M) Heavy Anti-Aircraft Regiment RA(TA) in January 1947.
| Aug 39 | Home Forces | Antrim, Co Antrim, UK |
| Feb 40 | 3 Anti-Aircraft Brigade, 12 Anti-Aircraft Division | Belfast, UK |
| May 43 | Middle East Forces | N Africa |
| Jun 43 | 9 Army | Palestine |
| Dec 43 | Middle East Forces | N Africa |
| Jan 44 | Suspended animation |
Batteries
| Sep 39 | 314, 315, 316, 175 (LAA), 176 (LAA) |
| Dec 40 | 314, 315, 316 |
| Jan 42 | 314, 315, 316, 431 |
| Jul 42 | 314, 315, 316 |
