 Both para-states were supported by the Yugoslav People's Army (JNA) and Serbia.The JNA pulled out in 1992, but transferred much of its equipment to the Bosnian Serb and Croatian Serb forces as it withdrew.Operation Winter '94 was the first in a series of successful advances made by the HV and the HVO in or near the Livanjsko field, an elongated flat-bottomed valley surrounded by hills.