 Complete the following phrase:  The RDB took part in combat operations in Bosnia and Herzegovina and Croatia in support of ethnic Serb forces  often flying without any markings or only marked with the Serbian flag. In 1997, RDB combat units were reorganised into a Brigade level unit: the Unit for Special Forces JSO, including the Aviation Unit. The JSO took part in numerous combat operations during the escalating Kosovo and Metochia crisis. Mi-24s were used to attack rebel training camps and hundreds of transport and medevac flight were carried out. During the 