Interior ministry
These two paramilitary units were allegedly the core of future JSO. The joint unit was officially formed in 1994, under the name of Unit for anti-terrorist action ("Jedinica za antiteroristička dejstva", JATD), one year before the wars in Bosnia and Croatia came to an end. The JATD first consisted of light mobile artillery and infantry. The unit operated as a part of the Serbian State Security (Resor Državne bezbednosti), which was then a part of Serbia's Interior ministry.