77 Searchlight Regiment RA (TA) formed in August 1940 with four batteries. The Regiment served in Anti-Aircraft Command in Swansea until becoming Light Anti-Aircraft. 77 Searchlight Regiment RA (TA) was converted in March 1943 to 146 Light Anti-Aircraft Regiment.
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 | Swansea, Glamorgan, UK | |
| Aug 40 |  |
5 Anti-Aircraft Division, 45 Anti-Aircraft Brigade | Swansea, Glamorgan, UK |
| Nov 40 |  |
9 Anti-Aircraft Division, 45 Anti-Aircraft Brigade | Swansea, Glamorgan, UK |
| Feb 41 | |
9 Anti-Aircraft Division, 61 Anti-Aircraft Brigade | Swansea, Glamorgan, UK |
| Mar 43 | Became 146 Light Anti-Aircraft Regiment | Saighton Camp, Chester, UK |
Batteries
| Aug 40 | 494, 495, 496, 497 |
| Oct 42 | 494, 496, 497 |