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|Noun||1.||intelligence activity - the operation of gathering information about an enemy|
information gathering - the act of collecting information
current intelligence - intelligence of all types and forms of immediate interest; usually disseminated without delays for evaluation or interpretation
combat intelligence, tactical intelligence - intelligence that is required for the planning and conduct of tactical operations
strategic intelligence - intelligence that is required for forming policy and military plans at national and international levels
SIGINT, signals intelligence - intelligence information gathered from communications intelligence or electronics intelligence or telemetry intelligence
clandestine operation - an intelligence operation so planned and executed as to insure concealment
overt operation - the collection of intelligence openly without concealment
reconnaissance, reconnaissance mission - the act of reconnoitring (especially to gain information about an enemy or potential enemy); "an exchange of fire occurred on a reconnaissance mission"
counterintelligence - intelligence activities concerned with identifying and counteracting the threat to security posed by hostile intelligence organizations or by individuals engaged in espionage or sabotage or subversion or terrorism