1 Medium Brigade was re-designated 1 Medium Regiment RA in May 1938 with two batteries. The Regiment fought in France with the BEF in 1940. It moved to India in December 1942 serving there and Burma until the end of the war. In March 1947 the Regiment was reduced to a cadre. The following month 1 Medium Regiment RA was re-designated as 51 Coast Regiment RA.
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.
| 9 Sep 39 |  |
Southern Command | Portsmouth, Hampshire, UK |
| Sep 39 | Home Forces | UK | |
| Oct 39 | British Expeditionary Force | France | |
| Jun 40 | Home Forces | UK | |
| Jul 42 | |
Southern Command | UK |
| Dec 42 |  |
33 Indian Corps | India |
| Oct 43 |  |
Southern Army | India |
| Dec 43 | |
33 Indian Corps | India |
| Feb 44 | |
33 Indian Corps | Burma (Myanmar) |
| Mar 44 |  |
15 Indian Corps | Waybin, Burma (Myanmar) |
| May 44 | |
33 Indian Corps | Burma (Myanmar) |
| May 44 | |
33 Indian Corps | Kohima, India RHQ & 5/22 Battery only |
| Jun 45 |  |
12 Army | Rangoon, Burma (Myanmar) |
Batteries
| Sep 39 | 1/3, 5/22 |
Equipment
| Sep 39 | 6 inch Howitzer, Matador Tractor |
| Jul 42 | 5.5 inch guns |