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 was considered a War Formed Regiment in January 1947 and re-designated as 75 Heavy Anti-Aircraft Regiment RA in April that year.
| Jan 42 | Formed | Gloucester, Gloucestershire, UK |
| Jan 42 | 5 Anti-Aircraft Brigade, 1 Anti-Aircraft Division | Gloucester, Gloucestershire, UK |
| Jun 42 | 67 Anti-Aircraft Brigade, 9 Anti-Aircraft Division | Gloucester, Gloucestershire, UK |
| Oct 42 | 67 Anti-Aircraft Brigade, 3 Anti-Aircraft Group | South West England |
| Jun 45 | 37 Anti-Aircraft Brigade, 1 Anti-Aircraft Group | 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 |
