Whoops, sorry, Bosco—I put the “end italics” marker in the wrong place and it looks like I’m taking credit for your citation of the NR article. My mistake!
Wesley Clark served as SACEUR (Supreme Allied Commander Europe) for NATO, and was responsible for the inept prosecution of the war in Kosovo in 1999. He was then pressured to retire. He's considered to be a failure by many military members who served during that time, and his subsequent anti-war, anti-Bush positions come as no surprise.
Here's a recap by Richard Lowry of National Review.