On 5 May the number of ZNG troops and their composition was determined, followed by operational guidelines issued by Defence and Interior Ministers Martin Špegelj and Josip Boljkovac for the transfer of police personnel to the ZNG on 10 May. By 15 May several special police units (SPUs) transferred to the ZNG, forming four brigades. By July the ZNG had approximately 8,000 troops and, unlike other Croatian forces, were fully equipped with small arms. The reserve police force, numbering about 39,000 in April, was also transferred to reserve ZNG brigades and independent battalions. On 18 May the Zrinski Battalion was established as a special forces unit of the ZNG, its core consisting of 27 volunteers drawn from the Kumrovec SPU. Initially, it also relied on former French Foreign Legion troops. By July, the reserve force of 40,000 ZNG troops was assigned to 19 brigades and 14 independent battalions; however, they did not possess sufficient heavy or small arms for all their personnel. The Croatian police had approximately 15,000 small arms, with less than 30,000 additional weapons obtained from abroad by August.