During this whole time our planes have tended to stay above 15,000 feet. This page shows some of what the Pentagon thinks the Serbs have that chould hit us if we go beow that level. Behold the SA-6. It is radar-guided and can travel at Mach 2. The war is being run by a NATO political committee in Brussels.
War running by committe never works.
NATO government are unwilling to risk anger the publicby incuring casualites.