clandestine operation

English Thesaurus

1. an intelligence operation so planned and executed as to insure concealment (noun.act)

hypernym	:	intelligence, intelligence activity, intelligence operation,
definition	:	the operation of gathering information about an enemy (noun.act)

hyponym	:	exfiltration operation,
definition	:	a clandestine rescue operation to bring a defector or refugee or an operative and family out of danger (noun.act)