The Serbian Army of Krajina (SAK, Serbo-Croatian: Srpska vojska Krajine, Српска војска Крајине, abbr.The SVK, along with the state of RSK, ceased to exist in 1995 following the Croatian military offensive Operation Storm.In 1995, the International Institute for Strategic Studies (IISS) estimated that the SVK had a total of 250 tanks and 100 armoured personnel carriers.[4] In 1995, the IISS estimated that the SVK had 16 fixed-wing combat aircraft and 9 helicopters in service.[4] During the Croatian War of Independence, numerous massacres were conducted by the Army of Serbian Krajina.