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 served in Anti-Aircraft Command in Southern England until its conversion in early 1945. 48 (Hampshire) Searchlight Regiment RA (TA) 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.
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 48 Anti-Aircraft Battalion Royal Engineers | ||
| Aug 40 |  |
5 Anti-Aircraft Division, 35 Anti-Aircraft Brigade | Portsmouth, Hampshire, UK |
| May 41 | |
5 Anti-Aircraft Division, 47 Anti-Aircraft Brigade | Southampton, Hampshire, UK |
| Oct 42 |  |
2 Anti-Aircraft Group, 35 Anti-Aircraft Brigade | Portsmouth, Hampshire, UK |
| Dec 42 | |
2 Anti-Aircraft Group, 47 Anti-Aircraft Brigade | South East England |
| May 44 | |
6 Anti-Aircraft Group, 35 Anti-Aircraft Brigade | Portsmouth, Hampshire, UK |
| Aug 44 | |
6 Anti-Aircraft Group, 67 Anti-Aircraft Brigade | South East England |
| Jan 45 | Became 636 Infantry Regiment RA |
Batteries
| Aug 40 | 391, 392, 393, 394 | |
| Mar 43 | 391, 392, 393 |