AUXILIARY UNIT SPECIAL DUTIES BASE

SN A well concealed structure, usually constructed undergound, intended for use by members of the Special Duties section of the Auxiliary Units (or British Resistance Organization) in the event of invasion.
CL DEFENCE
BT AUXILIARY UNIT SITE
NT AUXILIARY UNIT SPECIAL DUTIES CONTROL STATION
AUXILIARY UNIT SPECIAL DUTIES OUTSTATION
AUXILIARY UNIT SPECIAL DUTIES ZERO STATION