I suspect not being promoted is the source of 'those in the Pentagon' who the Dems and the DbM use to try to establish their basis for dumping Sec'y Rumsfeld. With Rumsfeld's plans to re-organize the armed forces, some of these people, sadly are deadwood and have no place in a new Defense Dep't.
Keeping in mind that I know nothing other than what was reported in the media.......but Clarke was obsessed with cyber terrorism and that was not deemed the biggest threat....therefore, he was moved out of his position.