Converted from Pembroke (Castlemartin) Yeomanry (TF) in September 1920 at Tenby. It became 102 (Pembroke & Cardigan) Brigade Royal Field Artillery (TF). The batteries of the Brigade were formed from the Yeomanry Squadrons. In June 1924 it re-titled as 102 (Pembroke & Cardigan) (Army) Field Brigade RA (TA). In August 1937 it changed title again becoming 102 (Pembroke & Cardiganshire) Army Field Brigade RA (TA). 102 (Pembroke & Cardiganshire) Field Regiment RA (TA) was re-designated from 102 Field Brigade in November 1938 on a two battery basis. A third battery was raised in March 1941. 102 (Pembroke & Cardiganshire) Field Regiment RA (TA) was converted to 102 (Pembroke Yeomanry) Medium Regiment RA (TA) in September 1943.
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.
| 3 Sep 39 |  |
38 Infantry Division | Pembroke Dock, Pembrokeshire, UK |
| Nov 41 | Home Forces | Ascot, Berkshire, UK | |
| Nov 42 |  |
1 Army | N Africa |
| Jul 43 |  |
Allied Forces HQ | N Africa |
| Sep 43 | Became 102 Medium Regiment | Medjez, Tunisia |
Batteries
| Sep 20 | 405, 406, 407, 408 |
| Nov 38 | 405 (Pembroke Yeomanry), 406 (Pembroke Yeomanry) – 407 & 408 Batteries to 146 Field Regiment |
| Mar 41 | 405, 406, 473 |
Equipment
| Nov 42 | 473 Battery, 25 pdr Self Propelled Bishop |
| Apr 43 | 12 x 25 pdr, 8 x 25 pdr Self Propelled Sexton |