| Jan 41 | Formed – Mobile Naval Base Defense Organisation 2 |
Hayling Island, Hampshire, UK |
| Nov 41 | Air Defence Great Britain | South coast, UK |
| Aug 42 | Re-designated 4 Royal Marine Light Anti-Aircraft Regiment |
Nottingham, Nottinghamshire, UK |
Batteries
| Jan 41 | G, H & 25 Light Anti-Aircraft batteries |
| Aug 42 | 24, 25, 26 – G & H Batteries to 3 Royal Marine Heavy Anti-Aircraft Regiment |