84 Searchlight Regiment RA (TA) was formed in December 1940 with four batteries, at Hereford. The Regiment served in Anti-Aircraft Command until disbandment. it served mostly in the Humber area. 84 Searchlight Regiment RA (TA) was disbanded in October 1943.
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.
| Dec 40 | Formed | Hereford, Herefordshire, UK | |
| Dec 40 |  |
10 Anti-Aircraft Division, 39 Anti-Aircraft Brigade | Humber estuary, UK |
| Oct 42 |  |
5 Anti-Aircraft Group, 39 Anti-Aircraft Brigade | Humber estuary, UK |
| Feb 43 | |
5 Anti-Aircraft Group, 50 Anti-Aircraft Brigade | North Midlands, UK |
| Oct 43 | Disbanded |
Batteries
| Dec 40 | 512, 517, 518, 519 |
| Sep 43 | 512, 517, 519 |