secret service

Secret Intelligence Service (SIS) / Military Intelligence, Section 6 (MI6)

secret defense service

secret (security classification)

secret

secret agent intelligence

secret internet protocol router network (SIPRNET)

top secret (security classification)

top secret

state secret

be drawn from secret intelligence

be marked top secret

foreign secret agent

give away the secret by careless talk

clear secret

clearance for top secret work

secret clearance

secret language

secret post

secret qualification clearance

secret security clearance

secret text

secret weapon

microdot secret writing

branch (military/service branch, armed service)

separate from active service / the service

Y service (Y-service) / Y-station

regional meteorological service/ regional weather service (RWS)

emergency service / emergency operations service

active military service

active service/ duty

administrative service

aerodrome control service