40 (The Sherwood Foresters) Searchlight Regiment RA (TA) formed in August 1940 by the transfer of 40 (The Sherwood Foresters) Anti-Aircraft Battalion Royal Engineers (TA) to the RA. The Regiment served in Anti-Aircraft Command until conversion in mid 1943. Based in Lincolnshire, it moved to Northern Ireland just before becoming a Light Anti-Aircraft Regiment. 40 (The Sherwood Foresters) Searchlight Regiment RA (TA) was converted to 149 Light Anti-Aircraft Regiment RA in June 1943. It was re-constituted as 575 (6th Battalion The Sherwood Foresters) Light 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 40 Anti-Aircraft Battalion Royal Engineers | ||
| Aug 40 |  |
10 Anti-Aircraft Division, 39 Anti-Aircraft Brigade | Scunthorpe, Lincolnshire, UK |
| May 43 |  |
7 Anti-Aircraft Group, 103 Anti-Aircraft Brigade | Holywood, Co. Down, UK |
| Jun 43 | Became 149 Light Anti-Aircraft Regiment |
Batteries
| Aug 40 | 358, 359, 360, 361 |
| May 43 | 358, 360, 361 |