CIVIL DEFENCE SITE

SN Sites and buildings used in the coordination of the defence of the civilian population during times of war. Could also be used during times of national emergency.
CL MILITARY DEFENCE AND FORTIFICATION
BT DEFENCE SITE
NT AIR RAID PRECAUTIONS SITE
AIR RAID SHELTER
BUFFER DEPOT
CIVIL DEFENCE BUILDING
CIVIL DEFENCE TRAINING GROUND
NUCLEAR BUNKER
ROYAL OBSERVER CORPS SITE