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 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.
| Aug 40 | Formed from 49 Anti-Aircraft Battalion Royal Engineers | |
| Oct 40 | 31 Anti-Aircraft Brigade, 10 Anti-Aircraft Division | West Yorkshire, UK |
| Oct 42 | 31 Anti-Aircraft Brigade, 5 Anti-Aircraft Group | West Yorkshire, UK |
| Aug 43 | 50 Light Anti-Aircraft Brigade, 5 Anti-Aircraft Group | West Yorkshire, UK |
| Oct 44 | Became 49 Garrison Regiment RA |
Batteries
| Aug 40 | 395, 396, 397, 398 |
| Jan 42 | 395, 396, 398 |
