ACTIVE AIR DEFENCE SITE

SN A site equipped for active defensive action against an airborne enemy assault.
CL MILITARY DEFENCE AND FORTIFICATION
BT AIR DEFENCE SITE
NT ANTI AIRCRAFT DEFENCE SITE
BLOODHOUND MISSILE LAUNCH SITE
BOMBING DECOY SITE
FIGHTER COMMAND STATION
PARACHUTE AND CABLE LAUNCHER
THOR MISSILE LAUNCH SITE