66 Anti-Tank Regiment RA(TA) was formed as a duplicate of 56 Anti-Tank Regiment with four batteries in June 1939. The Regiment was put in suspended animation in August 1945 and in January 1947 it was reconstituted as 390 (King’s Own) Light Anti-Aircraft Regiment RA(TA).
Granted title 66 (King’s Own) Anti-Tank Regiment February 1942
| 3 Sep 39 | 55 Infantry Division | Crosby, Merseyside, UK |
| Nov 39 | 55 Infantry Division | Rugeley, Staffordshire, UK |
| Apr 40 | 55 Infantry Division | Blythburgh, Suffolk, UK |
| May 40 | 59 Infantry Division | UK |
| Jul 40 | 55 Infantry Division | UK |
| Sep 40 | 55 Infantry Division | Guiting Power, Gloucestershire, UK |
| Nov 40 | 55 Infantry Division | Deddington, Oxfordshire, UK |
| Apr 41 | 55 Infantry Division | Alfriston, Sussex, UK |
| Jun 41 | 55 Infantry Division | Farnborough, Hampshire, UK |
| Jul 41 | 55 Infantry Division | Halesworth, Suffolk, UK |
| Sep 41 | 55 Infantry Division Cadre to form 81 Anti-Tank Regiment |
Robertsbridge, Sussex, UK |
| Jul 44 | Home Forces | UK |
Batteries
| 3 Sep 39 | 261, 262, 263, 264 |
| Aug 41 | 261, 263, 264, 297 |
| Oct 41 | 261, 263, 264 |
| Jan 42 | 261, 263, 264, 306 |
| Jul 42 | 261, 263, 264 |
| Jun 43 | 261, 263, 264, 334 |
Equipment
| Apr 40 | 2 pdr Guns, Ford Saloon tractors |
| Apr 41 | 2 pdrs replaced by French 75 mm Guns |
| Jun 41 | 2 pdrs reissued, 75’s returned |
