78 (1st East Anglian) Anti-Aircraft Brigade RA(TA) was formed in November 1938 by conversion of 84 (1st East Anglian) Field Brigade RA(TA). It was re-designated as 78 (Welsh) Anti-Aircraft Regiment RA(TA) in January 1939. In June 1940 it was re-designated as Heavy Anti-Aircraft. The Regiment was placed in suspended animation in December 1944 and reconstituted as 284 (1st East Anglian) (M) Heavy Anti-Aircraft Regiment RA(TA) in January 1947.
| Sep 39 | 41 Anti-Aircraft Brigade, 2 Anti-Aircraft Division | East Anglia, UK |
| May 41 | 40 Anti-Aircraft Brigade | East Anglia, UK |
| Dec 41 | 41 Anti-Aircraft Brigade | East Anglia, UK |
| Apr 42 | War Office Reserve | UK |
| Oct 42 | 9 Army | Palestine |
| Jan 43 | 20 Anti-Aircraft Brigade | The Levant |
| Feb 43 | Diluted by African Pioneer Corps men | |
| Nov 43 | Middle East Forces | Eygpt |
| Jan 44 | 8 Anti-Aircraft Brigade, 8 Army | Brindisi, Italy |
| Dec 44 | Suspended animation |
Batteries
| Sep 39 | 243, 244, 245, 409 |
| Oct 41 | 243, 244, 245, 468 |
| Apr 42 | 243, 244, 245 |
