56 (King’s Own) Anti-Tank Regiment RA (TA) was converted from 4th Battalion The King’s Own Royal Regiment with four batteries in November 1938. It re-organised as 56 Light Anti-Aircraft/Anti-Tank Regiment in August 1943 and reverted to 56 (King’s Own) Anti-Tank Regiment RA (TA) in September 1944. The Regiment was put in suspended animation in April 1946. In January 1947 it was re-constituted as 380 (King’s Own) Anti-Tank Regiment RA (TA).
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.
| 3 Sep 39 |  |
42 Infantry Division | Ulverston, Cumbria, UK |
| 21 Apr 40 | |
42 Infantry Division | France |
| May 40 | |
42 Infantry Division | UK |
| Nov 41 |  |
76 Infantry Division | UK |
| Apr 42 |  |
70 Infantry Division | India |
| Jul 43 | Eastern Army | India | |
| Aug 43 | Became 56 Light Anti-Aircraft/Anti-Tank Regiment 2 batteries to 55 Light Anti-Aircraft/Anti-Tank Regiment |
||
| Oct 44 | Became 56 Anti-Tank Regiment | ||
| Oct 44 |  |
5 Indian Division | Burma (Myanmar) |
| May 45 |  |
14 Army | Burma (Myanmar) |
| Jun 45 |  |
12 Army | Burma (Myanmar) |
| Jun 45 | RA Training HQ 40 | India |
Batteries
| 3 Sep 39 | 221, 222, 223, 224 |
| Sep 41 | 224 Battery to 83 Anti-Tank Regiment on formation |
| Jul 43 | 203, 221, 222, 290 |
| Aug 44 | 221, 222, 351 |
Equipment
| Sep 39 | 2 pdr Guns |
| Oct 44 | 36 x 6 pdr Guns, 36 x 3 inch Mortars |
| Jun 45 | Re-armed as a Self Propelled Regiment |