142 (Royal Devon Yeomanry) Field Regiment RA (TA) was formed as a duplicate of 96 (Royal Devon Yeomanry) Field Regiment in July 1939 with two batteries . In November 1940 a third battery was formed at Bircotes, Nottinghamshire. The Regiment fought in Sicily and Italy. For its support of the Canadian Divisions it was awarded the right to wear the Maple Leaf of Canada as an arm badge. 142 (Royal Devon Yeomanry) Field Regiment RA (TA) went into suspended animation in November 1945 and was re-constituted as 342 (Royal Devon Yeomanry) Medium Regiment RA (TA) in January 1947.
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.
(Title authorised February 1942)
| Jul 39 |  |
45 Infantry Division | Dartmouth, Devon, UK |
| Jul 41 | |
45 Infantry Division | Wickford, Essex, UK |
| Nov 41 | Home Forces | UK | |
| Sep 42 |  |
79 Armoured Division | UK |
| Jul 43 |  |
8 Army | Sicily |
| Sep 43 | |
8 Army | Salerno, Italy |
| Oct 43 |  |
46 Infantry Division | Volturno, Italy |
| May 44 | |
8 Army | Cassino, Italy |
| Oct 44 | |
8 Army | Cesena, Italy |
| Nov 45 | Suspended animation |
Batteries
| Jul 39 | 383 (Torrington), 384 (South Molton) |
| Dec 40 | 383, 384, 506 |
Equipment
| Jul 43 | 25 pdr Self Propelled Bishop |
| Jul 44 | M7 105mm Self Propelled Priest |