64 (Essex Regiment) Searchlight Regiment RA(TA) formed in August 1940 by the transfer of 1/6th Battalion The Essex Regiment (64 Searchlight Regiment) (TA) to the RA. The Regiment was converted to 639 Infantry Regiment in January 1945. It was re-constituted as 599 (Essex) Heavy Anti-Aircraft Regiment RA(TA) in January 1947.
| Nov 38 | 1/6th Essex Regiment (64 Searchlight Regiment) | West Ham, London, UK |
| Aug 40 | Became RA | |
| Aug 40 | 40 Anti-Aircraft Brigade | Eastern England airfields |
| Aug 43 | 31 Anti-Aircraft Brigade, 5 Anti-Aircraft Group | Eastern England |
| Mar 44 | 50 Anti-Aircraft Brigade, 5 Anti-Aircraft Group | Eastern England |
| Jan 45 | Became 639 Infantry Regiment RA |
Batteries
| Aug 40 | 441, 442, 443 |
