таємна операція
clandestine operation; covert operation
covert influence operation
covert
covert action
covert activities
covert amphibious entry
covert attack
covert delivery
covert forces
covert intelligence
covert propaganda
covert warfare
covert way
carry out covert action
covert activity
covert intelligence officer identities
covert intelligence work
covert ops
information from covert sources
humanitarian operation; humanitarian relief operation (HUMRO)
PZ operation (pick-up zone operation)
noncombatant evacuation operation (NEO); non-combat evacuation operation
aeromobile operation
African Union / United Nations Hybrid operation in Darfur (UNAMID)
air defense operation
air logistic support operation
air operation
airborne and amphibious operation
airborne assault operation
airborne/ amphibious operation
air-land operation
air-landed operation