57 (King’s Own Yorkshire Light Infantry) Light Anti-Aircraft Regiment RA(TA) was formed as a duplicate of 5th Battalion KOYLI (53 LAA Regiment) (TA), in June 1939. The Regiment was placed in suspended animation in January 1946 at Shirecliffe Camp, Sheffield. It was re-constituted as 557 (King’s Own Yorkshire Light Infantry) (Mixed) Heavy Anti-Aircraft Regiment RA(TA) in January 1947.
| Jun 39 | Home Forces | Doncaster, Yorkshire, UK |
| Jun 40 | Landed on the 10th returned to UK on the 19th | St Malo/Cherbourg, France |
| Jun 40 | Home Forces | Blackdown, Sussex, UK |
| May 41 | Palestine & Trans Jordan | Palestine |
| Jul 41 | 1 Australian Anti-Aircraft Brigade | Tripoli, Lebanon |
| Oct 41 | 4 Indian Infantry Division | The Delta, Egypt |
| Sep 42 | 8 Army | N Africa |
| Jan 43 | 2 Anti-Aircraft Brigade | Palestine |
| Mar 43 | 4 Indian Division | Palestine |
| May 43 | 4 Indian Division | N Africa |
| Aug 43 | 78 Anti-Aircraft Brigade | N Africa |
| Oct 43 | 4 Indian Division | Syria |
| Nov 43 | 4 Indian Division | N Africa |
| Dec 43 | 4 Indian Division | Italy |
| Dec 44 | 4 Indian Division | Greece |
Batteries
| Jun 39 | 169, 170, 171 |