39 (The Lancashire Fusiliers) Searchlight Regiment RA (TA) formed in August 1940 by the transfer of 39 (The Lancashire Fusiliers) Anti-Aircraft Battalion Royal Engineers (TA) to the RA. The Regiment served in Anti-Aircraft Command, mostly in North West England. 39 (The Lancashire Fusiliers) Searchlight Regiment RA (TA) was reduced to a cadre in May 1943 and transferred to the infantry as 7th Battalion The Lancashire Fusiliers. It was re-constituted as 574 (The Lancashire Fusiliers) (Mixed) 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 40 | Formed from 39 Anti-Aircraft Battalion Royal Engineers | ||
| Aug 40 | Batteries detached to Lincolnshire, Dorset & Orkney. RHQ at Flixton | Manchester, UK | |
| Apr 41 |  |
4 Anti-Aircraft Division, 53 Anti-Aircraft Brigade | Liverpool, Merseyside, UK |
| May 42 | |
4 Anti-Aircraft Division, 53 Anti-Aircraft Brigade | Preston, Lancashire, UK |
| Nov 42 |  |
5 Anti-Aircraft Group, 53 Anti-Aircraft Brigade | Todmorden, Yorkshire, UK |
| Mar 43 | |
61 Anti-Aircraft Brigade | Swansea, Glamorgan, UK |
| May 43 | Became 7th Battalion Lancashire Fusiliers |
Batteries
| Aug 40 | 354, 355, 356, 357 |
| Dec 42 | 355, 357, 435, 499 |
| Jan 43 | 355, 357, 423, 499 |
| Jan 43 | 355, 357, 474, 499 |
| Feb 43 | RHQ, 474 |
| Mar 43 | HQ for independent batteries including 355 & 557 Batteries |