38 (The King’s Regiment) Searchlight Regiment RA (TA) formed in August 1940 by the transfer of 38 (The King’s Regiment) Anti-Aircraft Battalion Royal Engineers (TA) to the RA. The Regiment served in Anti-Aircraft Command until January 1945 when it converted to Infantry. 38 (The King’s Regiment) Searchlight Regiment RA (TA) was converted to 635 Infantry Regiment RA in January 1945. It went to suspended animation in January 1946 and was re-constituted as 573 (The King’s 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 38 Anti-Aircraft Battalion Royal Engineers | ||
| Aug 40 |  |
2 Anti-Aircraft Division, 50 Anti-Aircraft Brigade | Derby, Derbyshire, UK |
| Dec 40 |  |
OSDEF (less 352 Battery) | Orkney, UK |
| Nov 41 |  |
11 Anti-Aircraft Division, 68 Anti-Aircraft Brigade | West Midlands, UK |
| Oct 42 |  |
4 Anti-Aircraft Group, 68 Anti-Aircraft Brigade | West Midlands, UK |
| Jan 44 | |
2 Anti-Aircraft Group, 27 Anti-Aircraft Brigade | South East England |
| Jan 45 | Became 635 Infantry Regiment RA |
Batteries
| Aug 40 | 350, 351, 352, 353 |
| Feb 44 | 350, 351, 352 |