109 Heavy Anti-Aircraft Regiment RA (TA) was formed at Weybourne Practice Camp in September 1940. The Regiment served in Anti-Aircraft Command until May 1943. By March 1944 it had joined 2 Army preparing for the invasion of Europe. It moved to France in June 1944. 109 Heavy Anti-Aircraft Regiment RA (TA) was disbanded in February 1946.
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.
| Sep 40 | Formed | Weybourne, Norfolk, UK | |
| Sep 40 |  |
1 Anti-Aircraft Division, 49 Anti-Aircraft Brigade | London, UK |
| Dec 41 | |
1 Anti-Aircraft Division, 48 Anti-Aircraft Brigade | UK |
| Jun 42 | |
1 Anti-Aircraft Division, 49 Anti-Aircraft Brigade | UK |
| May 43 |  |
GHQ Reserve, 103 Anti-Aircraft Brigade | Norwich, Norfolk, UK |
| Mar 44 |  |
2 Army, 107 Anti-Aircraft Brigade | UK |
| Jun 44 | |
2 Army, 107 Anti-Aircraft Brigade | Normandy, France |
| Dec 44 |  |
1 Canadian Army, 107 Anti-Aircraft Brigade | Dieppe, France |
Batteries
| Sep 40 | 342, 343, 344 |
| Jan 41 | 342, 343, 344, 380 |
| Sep 41 | 342, 343, 344, 440 |
| Jul 42 | 342, 343, 344 |
Gun Sites Occupied
344 Battery
| Dates | Gun Site | Gun Defended Area |
| 1942 | BM5 Old Woking | Brooklands |