120 Light Anti-Aircraft Regiment RA (TA) was converted in January 1942 from 86 Searchlight Regiment. The Regiment served in Anti-Aircraft Command until going to War Office Control in March 1943. When not training it was on loan to 76 AA Brigade with whom it eventually went to France. The Regiment took part in D Day landing on Gold Beach and moved with 76 AA Brigade through France to Belgium by November 1944. It stayed there for the rest of the war protecting the approaches to Amsterdam. 120 Light Anti-Aircraft Regiment RA (TA) was disbanded in January 1946 in North West Europe.
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.
| Jan 42 | Formed from 86 Searchlight Regiment | ||
| Jan 42 |  |
12 Anti-Aircraft Division, 63 Anti-Aircraft Brigade | Kilmarnock, Ayrshire, UK |
| Feb 42 | Training | Holywood, Co Down, UK | |
| Apr 42 | |
12 Anti-Aircraft Division, 63 Anti-Aircraft Brigade | West Kilbride, Ayrshire, UK |
| Aug 42 |  |
2 Anti-Aircraft Division, 32 Anti-Aircraft Brigade | Stamford, Lincolnshire, UK |
| Nov 42 | |
2 Anti-Aircraft Division, 50 Anti-Aircraft Brigade | South Collingham, Nottinghamshire, UK |
| Mar 43 |  |
War Office Control on loan to 73 AA Brigade | Southampton, Hampshire, UK |
| Jun 43 | |
War Office Control on loan to 76 AA Brigade | Cheshire, UK |
| Sep 43 | |
War Office Control, 76 AA Brigade | Saffron Walden, Essex, UK |
| Dec 43 | |
War Office Control, 76 AA Brigade | Bournemouth, Dorset, UK |
| Feb 44 | |
War Office Control, 76 AA Brigade | Southend, Essex, UK |
| Mar 44 |  |
2 Army, 76 AA Brigade | Southampton, Hampshire, UK |
| 6 Jun 44 | |
2 Army, 76 AA Brigade | Gold Beach, Normandy, France |
| Sep 44 | |
2 Army, 76 AA Brigade | Boulogne, France |
| Nov 44 | |
2 Army, 76 AA Brigade | North Scheldt, Belgium |
| Jan 46 | Disbanded |
Batteries
| Jan 42 | 393, 394, 395 |
| Apr 42 | 393, 394, 395, 448 |
| Jul 42 | 11, 393, 394, 395 |
| Oct 42 | 393, 394, 395 |
Equipment
| Jan 42 | Fixed guns at static sites |
| Mar 43 | 54 x Towed 40mm Bofors |
| Sep 43 | 18 x Bofors 40 mm SP, 36 x Towed Bofors 40 mm |
| Mar 44 | 9 x Crusader AA Mk 1 |
| Aug 44 | Crusaders replaced by towed Bofors |
| Oct 44 | SP Bofors handed in. Regiment all towed |