Kontraobaveštajna služba (abbreviated KOS or КОС, Serbo-Croatian: Kontraobaveštajna/Kontraobavještajna služba or Контраобавештајна/Контраобавјештајна служба, Slovenian: Kontraobveščevalna služba, Macedonian: Контраразузнавачка служба) was the counter-intelligence service of the Yugoslav People's Army.
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KOS was formed in 1946 as one of the remnants of the Department for Protection of the People (OZNA), with State Security Directorate (UDBA) forming the second, civilian, component of the new security and intelligence structure of SFR Yugoslavia.
Most information is still scant due to its classification as military secret, but some can be traced in the media, especially during the Milošević tenure and the role played in the break-up of SFRY (e.g. Operation Labrador [1] and Operation Opera orientalis).