48 (Hampshire) Searchlight Regiment RA(TA) formed in August 1940 by the transfer of 48 (Hampshire) Anti-Aircraft Battalion Royal Engineers (TA) to the RA. The Regiment was converted to 636 Infantry Regiment RA in January 1945. It was re-constituted as 583 (Hampshire) (Mixed) Heavy Anti-Aircraft Regiment RA(TA) in January 1947.
| Aug 40 | Formed from 48 Anti-Aircraft Battalion Royal Engineers | |
| Aug 40 | 35 Anti-Aircraft Brigade | Portsmouth, Hampshire, UK |
| May 41 | 47 Anti-Aircraft Brigade, 5 Anti-Aircraft Division | Southampton, Hampshire, UK |
| Sep 42 | 35 Anti-Aircraft Brigade, 2 Anti-Aircraft Group | Portsmouth, Hampshire, UK |
| Dec 42 | 47 Anti-Aircraft Brigade, 2 Anti-Aircraft Group | South East England |
| May 44 | 35 Anti-Aircraft Brigade, 6 Anti-Aircraft Group | Portsmouth, Hampshire, UK |
| Aug 44 | 67 Anti-Aircraft Brigade, 6 Anti-Aircraft Group | South East England |
| Jan 45 | Became 636 Infantry Regiment RA |
Batteries
| Aug 40 | 391, 392, 393, 394 | |
| Mar 43 | 391, 392, 393 |
