46 (The Lincolnshire Regiment) Searchlight Regiment RA (TA) formed in August 1940 by the transfer of 46 (The Lincolnshire Regiment) Anti-Aircraft Battalion Royal Engineers (TA) to the RA. The Regiment served in Anti-Aircraft Command until late 1944 when it became Garrison troops. 46 (The Lincolnshire Regiment) Searchlight Regiment RA (TA) was converted to 46 Garrison Regiment RA in November 1944 and re-designated as 606 Infantry Regiment RA in February 1945. It was re-constituted as 581 (5th Battalion The Royal Lincolnshire Regiment) (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 46 Anti-Aircraft Battalion Royal Engineers | Newcastle, Tyne & Wear, UK | |
| Aug 40 |  |
7 Anti-Aircraft Division, 57 Light Anti-Aircraft Brigade | Newcastle, Tyne & Wear, UK |
| Dec 41 |  |
3 Anti-Aircraft Division, 36 Anti-Aircraft Brigade | Edinburgh, Midlothian, UK |
| Aug 42 |  |
OSDEF, 58 Anti-Aircraft Brigade | Orkney & Shetland, UK |
| Oct 43 |  |
3 Anti-Aircraft Group, 60 Anti-Aircraft Brigade | South West England |
| Nov 44 | Became 46 Garrison Regiment RA |
Batteries
| Aug 40 | 382, 383, 384, 385 |
| Mar 44 | 382, 383, 384 |