I'd disagree with "prevent genocide". That was some pro US intervention rationale; but in the end it was "the enemy", the Serbian/Montenegrins of the Federal Republic of Yugoslavia, that got ethnically cleansed. The US was involved.
The New York Times reported the US Air Force did the AWACs on this particular job and other sources report that the administration used mercenary contractors and supplied the invaders.
Prevent genocide was the ostensible reason for US/UN participation in the conflict. It's pretty difficult to see a logical reason for the US secondary goals (stabilising the area, securing territories for certain groups, [indirectly] effecting regime change in Serbia) which they actually achieved outside the context of "people are appealing to us to stop this genocide". The US doesn't get much strategic benefit from being on relatively good terms with the Kosovars.
See https://en.wikipedia.org/wiki/Operation_Storm
The New York Times reported the US Air Force did the AWACs on this particular job and other sources report that the administration used mercenary contractors and supplied the invaders.
Check out Serb population in Kosovo, too.