Wednesday, January 21, 2004 - Page updated at 12:00 A.M. Guest columnists Gen. Wesley Clark, character and courage By Chuck Larson and Dan Christman Special to The Times Retired four-star Army Gen. Wesley Clark did something truly historic recently — and it has nothing to do with his run for the White House. Clark testified against the former president of Serbia, Slobodan Milosevic, who is being tried for genocide by the International Criminal Tribunal at The Hague. For the first time in history, a former military commander faced down a former head of state in an international court of law....