18 Light Anti-Aircraft Regiment RA(TA) was formed with two batteries at Glasgow, in December 1938. The Regiment was placed in suspended animation in November 1946. It was re-constituted as 518 Light Anti-Aircraft/Searchlight Regiment RA(TA) in January 1947.
| Sep 39 | Scottish Command | Glasgow, UK |
| Jun 42 | 10 Army | Iraq |
| Sep 42 | PAI Force | Iraq |
| Feb 43 | 5 Infantry Division | Syria |
| Jun 43 | 5 Infantry Division | N Africa |
| Jul 43 | 5 Infantry Division | Sicily |
| Sep 43 | 5 Infantry Division | Italy |
| Jul 44 | 5 Infantry Division | Palestine |
| Feb 45 | 5 Infantry Division | Italy |
| Mar 45 | 5 Infantry Division | NW Europe |
Batteries
| Sep 39 | 54, 56, 99, 139 |
| Apr 41 | 54, 56, 99, 139, 252 |
| Aug 41 | 56, 99, 139, 252 |
| Dec 42 | 99, 139, 252 |
