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 Anti-Tank 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).
| 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 |
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| 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 |
