OK, let me see if I understand this:
The Serbs are bombed by the US AirForce under Bill Clintoon, as they are trying to stop the invasion of the Ethnic Albanians [muslim terrorists] in their home country, Yugoslavia and they are concidered Monsters.
Now the Serbs get to go to Afghanistan to help wipe out Muslim Terrorists....and they're Peace Keepers/Liberators.
Is it me, or is this a bunch of 
NO- it is not just you.
The Serbia & Montenegro of today is significantly different than Yugoslavia under Milosevic. Milosevic was the last of the communist thug class of ruler. He's been out of power for three years now. Remember how quickly the Warsaw Pact countries went from our enemies to our allies? Its happening now with Serbia & Monte--a good step for both them and us.
Point of clarification--the fight in the Serbian province of Kosovo was an insurgency by the ethnic Albanians who lived there, not an invasion.