the unit would later become known under the name Knindže (a portmanteau of "Knin" and "ninja"), and Vasiljković under the war name "Kapetan Dragan". The name "Red Berets" came after the battle for Glina, when Vasiljković distributed the berets to his men. The other wing of the unit was apparently formed in May 1991, in Eastern Slavonia. According to the hints given by Simatović, the unit seems to have been involved in Borovo Selo killings on 1–2 May, when 12 Croatian policemen were killed and several tens wounded. May 4 will later be taken as the unit's anniversary. According to several witness accounts, Radovan Stojičić "Badža", an official of the Serbian ministry of interior, was in charge of operations in Eastern Slavonia. Upon the arrival in the Eastern Slavonia theater, Željko Ražnatović "Arkan" took over the paramilitary unit under the name of "Serbian Volunteer Guard", later known as "Arkan's Tigers". On 23 November 1991, after taking control over Laslovo from Croatian forces, the Guard captured two Croatian T-55 tanks and began operating them. The Guard later took part in various operations in Bosnia: in Bijeljina in 1992, near Bihać in 1994, and at the Sana river in 1995. The Bihać operation, code-named "Operation Spider" ("Operacija Pauk") was done in cooperation with the Army of Serb Krajina and the Army of Republika Srpska. The goal was to assist the fledgling Autonomous Province of Western Bosnia, a Serb-allied Muslim entity fighting against the central Bosnian government. During "Operation Spider", members of the Serbian Volunteer Guard fought under the ad hoc name 3rd Tactical Group. In September 1995, at Sana river, the unit assisted the Army of Republika Srpska in re-establishing the defense lines against the joint Croatian-Bosniak offensive codenamed "Operation Mistral 2"/"Operation Sana". 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. The members of the unit first came into the public spotlight during a 1995 hostage crisis when UN personnel were being held captive by the Army of Republika Srpska. The unit