50 (The Northamptonshire Regiment) Searchlight Regiment RA(TA) formed in August 1940 by the transfer of 50 (The Northamptonshire Regiment) Anti-Aircraft Battalion Royal Engineers (TA) to the RA. The Regiment was converted to 637 Infantry Regiment RA in January 1945. It went into suspended animation in Feb ruary 1946 and was re-constituted as 585 (The Northamptonshire Regiment) (Mixed) Light Anti-Aircraft/Searchlight Regiment RA(TA) in January 1947.
| Aug 40 | Formed from 50 Anti-Aircraft Battalion Royal Engineers | |
| Aug 40 | 50 Light Anti-Aircraft Brigade, 2 Anti-Aircraft Division | Derby, Derbyshire, UK |
| Jan 45 | Became 637 Infantry Regiment RA |
Batteries
| Aug 40 | 400, 401, 402, 403 |
| Sep 42 | 401, 402, 403 |
