99 Anti-Aircraft Regiment RA(TA) was raised from the London Welsh in April 1939. It was re-designated as 99 Heavy Anti-Aircraft Regiment RA(TA) in June 1940. The Regiment was placed in suspended animation in April 1946 in NW Europe and reconstituted as 499 (Kensington) (M) Heavy Anti-Aircraft Regiment RA(TA) in January 1947.
| Apr 39 | 48 Anti-Aircraft Brigade, 1 Anti-Aircraft Division | London, UK |
| Jun 40 | 37 Anti-Aircraft Brigade, 6 Anti-Aircraft Division | Felixstowe, Suffolk, UK |
| May 41 | 59 Anti-Aircraft Brigade, Orkney & Shetland Defences | Scapa Flow, Orkney, UK |
| Aug 42 | 67 Anti-Aircraft Brigade, 3 Anti-Aircraft Group | Milford Haven, Pembrokeshire, UK |
| Oct 42 | Anti-Aircraft Command | Cheltenham, Gloucestershire, UK |
| Mar 43 | War Office Reserve | Leeds, Yorkshire, UK |
| Apr44 | 76 Anti-Aircraft Brigade, 2 Army | Southend, Essex, UK |
| Jun 44 | 76 Anti-Aircraft Brigade, 2 Army | Gold Beach, Normandy, France |
| Aug 44 | 101 Anti-Aircraft Brigade | Cherbourg, France |
| Sep 44 | 75 Anti-Aircraft Brigade | Ostend, Belgium |
| Dec 44 | 101 Anti-Aircraft Brigade | Brussels, Belgium |
| Jan 45 | 101 Anti-Aircraft Brigade | Helmond, Holland |
| Apr 45 | 76 Anti-Aircraft Brigade | South Beveland, Holland |
| May 45 | 101 Anti-Aircraft Brigade | Hamburg, Germany |
Batteries
| Apr 39 | 302, 303 |
| Apr 40 | 302, 303, 318 |
| Aug 42 | 302, 303, 399 |
| Sep 42 | 302, 303, 318 |
Equipment
| May 40 | 303 Battery – 3 inch 20 cwt |
Gun Sites Occupied
302 Battery
| Dates | Gun Site | Gun Defended Area |
| 24 Aug 39-5 Jun 40 | ZS17 Mitcham Common | London IAZ |
| 6 Jun 40-May 41 |
H9 Martlesham H10 Brightwell H12 Nacton Heath |
Martlesham Martlesham Ipswich |
| May 41-Aug 42 |
R1 & R2 |
Scapa |
303 Battery
| Dates | Gun Site | Gun Defended Area |
| 24 Aug 39 |
ZS13 Shirley Park ZS15 Norbury |
London IAZ |
| May 40-5 Jun 40 |
ZS10 Hayes Common |
London IAZ |
| 6 Jun 40-Sep 40 |
H2 Searsons Farm |
Harwich |
| Sep 40-Dec 40 |
ZS17 Mitcham Common |
London IAZ |
| May 41-Aug 42 |
R3 & B1 |
Scapa |
318 Battery
| Dates | Gun Site | Gun Defended Area |
| 15 May 40-30 Jun 40 |
ZS14 Dulwich ZS16 Clapham Junction |
London IAZ |
| 30 Jun 40-May 41 |
H1 Landguard H3 Dovercourt |
Harwich |
| May 41-Sep 41 |
F1 & F2 |
Scapa |
