 The JNA maintained substantial forces in the Croatian capital, Zagreb, throughout 1991.In August 1991, the Yugoslav Air Force's Counterintelligence Service (KOS) executed a series of activities, codenamed Operation Labrador, aimed at discrediting the new Croatian government.Operation Labrador was planned to include several terrorist attacks that would go hand-in-hand with the activities of Operation Opera — a propaganda campaign devised to feed disinformation to the media.