Negligence. They had what they needed to be ready and were not. They had recon planes and didnt use them. They had radar but used it poorly. End of story, they were suprised and it is the responsibility of a base comander to be ready for any type of attack at anytime.

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The Muslim Brotherhood “must understand that their work in America is a kind of grand Jihad in eliminating and destroying the Western civilization from within and ‘sabotaging’ its miserable house by their hands..." — Mohamed Akram. http://jihadwatch.org/