Sometimes in cooperation with technical personnel at other agencies such as the NSA when the collection discipline is SIGINT, or the DIA when the techniques come MASINT, or other appropriate agencies such as the Department of Energy for nuclear information, the CIA may work to place technical collection equipment in denied territory. They have also cooperated in placing such equipment into U.S. embassies. Emplacing and servicing such equipment is another form of clandestine operation, of which the adversary should not be aware. These include: