 Complete the following phrase:  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 12 May, when 12 Croatian policemen were killed and several tens wounded. May 4 will later be taken as the units 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, better known as Arkans Tigers. On 23 November 1991, after taking control over Laslovo from Croatian forces, the Guard captured two Croatian T-55 tanks and began utilizing 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 