Please tell us more, I'm not fully up-to-speed on General Clark's background.
I am sure you can find a lot about him.
It isn't Politically Correct to point out that he was relieved of command, but I am sure you can find out why if you search.
I do not know the details off the top of my head, but it has something to do with the Bosnian thing, which was done by NATO.
I would have to search, so it is "an excersize left to the students."
Wikipedia can be Left Wing.
In 1994 during the Bosnian War when Clark was still a 3 star general he met with one of the Bosnian Commanders/War Criminals against State Department orders. He was sent there to represent the Joint Chiefs and was ordered not to meet with anyone suspected of war crimes. The man he met with was Ratko Mladic, suspected of various war crimes and current fugitive of the UN.