55 (Devon) Light Anti-Aircraft Regiment RA (TA) was formed as a duplicate of 51 (Devon) Light Anti-Aircraft Regiment, in 1939. It moved to Ceylon (Sri Lanka) in March 1942 and then on to India the following year. The Regiment was converted to 55 Light Anti-Aircraft/Anti-Tank Regiment in July 1943 and re-designated 111 (Devon) Anti-Tank Regiment in September 1944. 55 (Devon) Light Anti-Aircraft Regiment RA (TA) was re-constituted as 852 (Devon) Tractor Battery RA (TA) in January 1947 but not re-formed.
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.
| Sep 39 | Home Forces | UK | |
| Apr 40 | 6 Anti-Aircraft Brigade | Norway | |
| Jun 40 | Home Forces | UK | |
| Mar 42 |  |
Ceylon Command, 1 Anti-Aircraft Brigade Royal Marines | Colombo, Ceylon (Sri Lanka) |
| Jul 43 | Calcutta Area | India | |
| 29 Jul 43 | Became 55 Light Anti-Aircraft/Anti-Tank Regiment |
Batteries
| Sep 39 | 163, 164, 165 |
| Jun 42 | 163, 164, 165, 524 |
Equipment
| Apr 40 | Bofors 40 mm |