71 Anti-Aircraft Brigade was raised in June 1942. It served with 6 Anti-Aircraft Division in the Thames Estuary area. Later the Division came under 2 Anti-Aircraft Group.
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.
| Jun 42 | Thames Estuary |  | 6 Anti-Aircraft Division |
| Oct 42 | Thames Estuary |  | 2 Anti-Aircraft Group |
Order of Battle 1942
| 72 Heavy Anti-Aircraft Regiment (217, 218, 393 Batteries) – Joined Jun, left Jul 42 |
| 85 Heavy Anti-Aircraft Regiment (174, 175, 220 Batteries) – Joined Jul 42 |
| 90 Heavy Anti-Aircraft Regiment (272, 284, 285 Batteries) – Joined Sep 42 |
| 127 Heavy Anti-Aircraft Regiment (396, 411, 422, 433 Batteries) – Joined Jun 42 |
| 66 Light Anti-Aircraft Regiment (175, 176, 276 Batteries) – Joined Jun, left Sep 42 |
| 122 Light Anti-Aircraft Regiment (400, 401, 402 Batteries) – Joined Jul 42 |
| 129 Light Anti-Aircraft Regiment (425, 426, 427, 455 Batteries) – Joined Sep 42 |
| 132 Light Anti-Aircraft Regiment – Joined Jun, left Jul 42 |