104 Heavy Anti-Aircraft Regiment RA (TA) was formed in August 1940. It served with Anti-Aircraft Command until July 1943 when it moved to the Middle East. The Regiment fought in Sicily and Italy, returning to the UK in August 1944. 104 Heavy Anti-Aircraft Regiment RA (TA) was disbanded in September 1944.
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 40 | Formed | ||
| Aug 40 |  |
8 Anti-Aircraft Division, 60 Anti-Aircraft Brigade | UK |
| Aug 43 |  |
War Office control | Arbroath, Angus, UK |
| Aug 43 |  |
8 Army, 73 Anti-Aircraft Brigade | Port Augusta, Sicily |
| Oct 43 |  |
Allied Forces HQ, 73 Anti-Aircraft Brigade | Gerbini, Sicily |
| Dec 43 | |
Allied Forces HQ, 25 Anti-Aircraft Brigade | Bari, Italy |
| Aug 44 | Home Forces | UK | |
| Sep 44 | Disbanded |
Batteries
| Aug 40 | 328, 329, 336 |
| Apr 41 | 328, 329, 336, 411 |
| Sep 41 | 328, 329, 336, 452 |
| Jul 42 | 328, 329, 336 |