143 (Mixed) Heavy Anti-Aircraft Regiment RA (TA) was formed at Quedgeley Court, Gloucester in January 1942. It became a non-mixed Regiment in August 1945. The Regiment Served in Anti-Aircraft Command for the whole of its war. 143 (Mixed) Heavy Anti-Aircraft Regiment RA (TA) was considered a War Formed Regiment in January 1947 and re-designated as 75 Heavy Anti-Aircraft Regiment RA in April that year.
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.
| Jan 42 | Formed | Gloucester, Gloucestershire, UK | |
| Jan 42 |  |
9 Anti-Aircraft Division, 5 Anti-Aircraft Brigade | Gloucester, Gloucestershire, UK |
| Jun 42 | |
9 Anti-Aircraft Division, 67 Anti-Aircraft Brigade | Gloucester, Gloucestershire, UK |
| Oct 42 |  |
3 Anti-Aircraft Group, 46 Anti-Aircraft Brigade | South West England |
| Mar 44 | |
3 Anti-Aircraft Group, 55 Anti-Aircraft Brigade | Plymouth, Devon, UK |
| Jan 45 | |
8 Anti-Aircraft Group | UK |
| Jun 45 | |
1 Anti-Aircraft Group, 37 Anti-Aircraft Brigade | London, UK |
Batteries
| Jan 42 | 620, 621 |
| Feb 42 | 494, 495 (Mixed), 496 (Mixed), 620, 621 |
| Jun 42 | 474 (M), 494, 495 (M), 496 (M), 620, 621 |
| Aug 42 | 494, 495 (M), 620, 621 |
| Nov 42 | 494, 495 (M), 589, 620, 621 |
| Jan 43 | 494, 495 (M), 589, 620 |
| Dec 44 | 494, 495 |