21st Light Anti-Aircraft Regiment – protilietadlový pluk, súčasť Royal Artillery a Territorial Army
Organizačná štruktúra 03.09.1939 – dislokácia - West Lancashire Area, Western Command
Súčasť: 53rd Light Anti-Aircraft Brigade
Zloženie:
Velitelstvo - Liverpool
67th Battery - Bromborough
68th Battery - Ellesmore Port
69th Battery - Northwich
80th Battery - Kearsley, Manchester
136th Battery
- 393rd Troop - Tern Hilly
- 394th Troop – Shawbury
- 395th Troop - Crew Junction
- 396th Troop - Crew Junction
Zdroj: http://home.adelphia.net/~dryan67/orders/aa.html
Organizačná štruktúra 03.09.1939 – dislokácia - West Lancashire Area, Western Command
Súčasť: 53rd Light Anti-Aircraft Brigade
Zloženie:
Velitelstvo - Liverpool
67th Battery - Bromborough
68th Battery - Ellesmore Port
69th Battery - Northwich
80th Battery - Kearsley, Manchester
136th Battery
- 393rd Troop - Tern Hilly
- 394th Troop – Shawbury
- 395th Troop - Crew Junction
- 396th Troop - Crew Junction
Zdroj: http://home.adelphia.net/~dryan67/orders/aa.html