532 (Pembroke) Coast Regiment RA (TA) was formed from the Pembroke Heavy Regiment RA(TA), in September 1940. RHQ 532 (Pembroke) Coast Regiment RA (TA) and the Fire Command was converted to 620 Infantry Regiment RA (TA) in January 1945 at Ty Croes. 620 Regiment was placed in suspended animation in December 1945 and was reconstituted as 424 (Pembrokeshire) Heavy Anti-Aircraft Regiment RA (TA) and 425 (Pembrokeshire) Coast 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.
| Sep 40 | Formed from Pembroke Heavy Regiment | Milford Haven, Pembrokeshire, UK | |
| Sep 40 |  |
Western Command | Milford Haven, Pembrokeshire, UK |
| Dec 42 | Milford Haven Fire Command | Milford Haven, Pembrokeshire, UK | |
| Jan 45 | RHQ became 620 Infantry Regiment RA | Ty Croes, Anglesey, UK |
Batteries
| Sep 40 | A (West Blockhouse) |
| Dec 40 | A, 367 (Soldier’s Rock), 368 (Fishguard) |
| May 41 | 131 (West Blockhouse), 367, 368 |
| Dec 41 | 131, 367, 368, 429 – 62 Coast Observer Detachment |
| May 42 | 357, 367, 368, 429 – 62 Coast Observer Detachment |
| Jan 43 | 357, 367, 368, 429 – 14, 32 & 62 Coast Observer Detachments |
| Jul 43 | 357, 367, 368, 429 – 14, 32, 62 & 106 Coast Observer Detachments |