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clandestine operations stresses
mil.	секретные операции; тайные операции в тылу противника
clandestine operation
amer.	литерная операция (Maggie)
data.prot.	скрытная работа
intell.	тайная операция; секретная миссия (Val_Ships)
mil.	скрытная операция (Andrey Truhachev)
sec.sys.	скрытая операция; скрытая работа; секретная операция (In a covert operation, the identity of the sponsor is concealed, while in a clandestine operation the operation itself is concealed. Val_Ships)
English thesaurus
clandestine operation
mil., logist.	Secret operation in which the identity of the executants nationality and belonging to regular armed forces is hidden, as well as that of their representative, by disconnecting any relationship between the two, in order to save the representative the duty of taking on the responsibility. (FRA)
USA	An operation sponsored or conducted by governmental departments or agencies in such a way as to assure secrecy or concealment (JP 3-05) see also covert operation, overt operation

clandestine operations: 2 phrases in 2 subjects

Military	1
Security systems	1