Belz...
Fiend God
I think the real mystery of the attack on pentagon you all should talk about instead is the failure in communication between the faa and norad. It's odd that the pentagon was struck by AA77 45 minutes after the second wtc strike in nyc, 75 minutes after faa was notified that AA77 had been hijacked and no fighter jets were visible in the skies of DC to defend the hijacked plane.
You're not going to answer ANY more questions, will you ?
Was it an incompetent failure or was the system designed to fail on that day?
False dichotomy. It could very well be that they simply couldn't intervene in time.