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 served in Anti-Aircraft Command until November 1942. It moved to the Middle East in May 1943 serving in North Africa and Palestine. The Regiment was placed in suspended animation in January 1944. 102 Heavy Anti-Aircraft Regiment RA (TA) was reconstituted as 502 (Ulster) (M) Heavy Anti-Aircraft Regiment RA (TA) in January 1947.
Illustrations of the formation badges under which a unit served or supported are given. This is no guarantee that the unit used this formations badge.
| Aug 39 |  |
3 Anti-Aircraft Division, 3 Anti-Aircraft Brigade | Antrim, Co Antrim, UK |
| Feb 40 |  |
12 Anti-Aircraft Division, 3 Anti-Aircraft Brigade | Belfast, UK |
| Oct 42 |  |
2 Anti-Aircraft Group, 37 Anti-Aircraft Brigade | London, UK |
| Nov 42 | Unbrigaded | UK | |
| May 43 |  |
Middle East Forces | N Africa |
| Jun 43 |  |
9 Army | Palestine |
| Dec 43 | |
Middle East Forces, 1 Anti-Aircraft Brigade | 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 |