Bosnian War commander Blaž Kraljević and incorporated into the HVO and ARBiH. The Army of Republika Srpska ("", VRS) was established on 12 May 1992. It was loyal to Republika Srpska, a Serb breakaway state that sought unification with FR Yugoslavia. Serbia provided logistical support, money and supplies to the VRS. Bosnian Serbs had made up a substantial part of the JNA officer corps. Milošević relied on the Bosnian Serbs to win the war themselves. Most of the command chain, weaponry, and higher-ranked military personnel, including General Ratko Mladić, were JNA. Various paramilitary units were operated during the Bosnian War: the Serb
Army of the Republic of Bosnia and Herzegovina Beretke (Green Berets) and Crni Labudovi (Black Swans) units were also active. Other irregular groups included Bosnian mafia groups, as well as collections of police and former Yugoslav People's Army soldiers. The army was formed in poor circumstances, and suffered from a very limited supply of arms. Critical deficiencies included tanks and other heavy weaponry. The first commander of the army was Sefer Halilović. In 1992, the ARBiH was losing most of the battles and consequently 70% of Bosnia was under Yugoslav People's Army (JNA), later Bosnian Serb Army (VRS), control. Sarajevo was under siege. The ARBiH had defended Sarajevo