clearance for top secret work

допуск до цілком таємної роботи

top-attack (top attack; top-down attack )

top secret (security classification)

be marked top secret

secret clearance

secret qualification clearance

secret security clearance

work hygiene / hygiene of work

clearance for confidential work

secret (security classification)

secret agent intelligence

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

secret internet protocol router network (SIPRNET)

be drawn from secret intelligence

foreign secret agent

give away the secret by careless talk

secret defense service

secret language

table-top exercise (TTX)

top dead center (TDC)