49 (The West Yorkshire Regiment) Searchlight Regiment RA (TA) formed in August 1940 by the transfer of 49 (The West Yorkshire Regiment) Anti-Aircraft Battalion Royal Engineers (TA) to the RA. The Regiment served in Anti-Aircraft Command in West Yorkshire until being converted to a Garrison Regiment. As part of 50 AA Brigade, the Regiment was earmarked and trained for operations in Normandy. In the event the Searchlight Regiments were not required and remained in the UK. 49 (The West Yorkshire Regiment) Searchlight Regiment RA (TA) was converted to 49 Garrison Regiment RA in November 1944 and re-organised as 601 Infantry Regiment RA in February 1945. It was re-constituted as 584 (The West Yorkshire Regiment) 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 49 Anti-Aircraft Battalion Royal Engineers | ||
| Oct 40 |  |
10 Anti-Aircraft Division, 31 Anti-Aircraft Brigade | West Yorkshire, UK |
| Oct 42 |  |
5 Anti-Aircraft Group, 31 Anti-Aircraft Brigade | West Yorkshire, UK |
| Aug 43 | |
5 Anti-Aircraft Group, 50 Light Anti-Aircraft Brigade | West Yorkshire, UK |
| Oct 44 | Became 49 Garrison Regiment RA |
Batteries
| Aug 40 | 395, 396, 397, 398 |
| Jan 42 | 395, 396, 398 |