You could start by asking General Hugh Shelton , but I don’t think he is talking yet .
General H. Norman Swartzkopf has been. And Shelton has given us the clues. Per US News and World Report article:
on November 6, retired Gen. Norman Schwarzkopf appeared on CNBC's Capital Report, hosted by Gloria Borger and Alan Murray, who asked him what he thought of Clark. "I think the greatest condemnation against him . . . came from the chairman of the Joint Chiefs of Staff when he was a NATO commander. I mean, he was fired as a NATO commander," Schwarzkopf replied, "and when Hugh Shelton said he was fired because of matters of character and integrity, that is a very, very damning statement, which says, `If that's the case, he's not the right man for president,' as far as I'm concerned."
From the same article, from Gen Hugh Shelton:
When at a forum in September, retired Gen. Hugh Shelton was asked if he would support retired Gen. Wesley Clark for president, Shelton, the former chairman of the Joint Chiefs of Staff, quickly took a drink of water. "That question makes me wish it were vodka," Shelton said. "I've known Wes for a long time. I will tell you the reason he came out of Europe early had to do with integrity and character issues, things that are very near and dear to my heart. I'm not going to say whether I'm a Republican or a Democrat. I'll just say Wes won't get my vote."