By Donald Rumsfeld's own admission, he was unaware of any threats to the Pentagon -- the building where he was located during the September 11th attacks -- until an aircraft crashed into the side of it, and he ran out "into the smoke" to see if it might be a "A bomb? I had no idea." (ABC News This Week, Interview 9/16/01).
Well, that's a pretty tall tale by any standard. The New York Times reported that by 8:13am, the FAA was aware of the first hijacking out of Boston. The Pentagon explosion, which Donald Rumsfeld claimed he had "no idea," did not occur until approximately 9:37am, nearly an hour and a half later, this after two of the tallest buildings in the world were devastated. Note that a plane hijacked out of Boston can reach Washington D.C. as easily as it can reach New York City.
It was widely reported that Pentagon personnel were indeed aware of the threats to their security, and they took security measures on that morning.
But not the "Secretary of Defense." Why should the man charged with defending the United States of America concern himself with hijacked aircraft?
There is a set of procedures agreed upon between NORAD and the FAA for responding to hijackings. In particular, these procedures were changed on June 1, 2001 while Rumsfeld was in power as our Secretary of Defense, in a document called: "CHAIRMAN OF THE JOINT CHIEFS OF STAFF INSTRUCTION, J-3 CJCSI 3610.01A" (www.dtic.mil/doctrine/jel/cjcsd/cjcsi/3610_01a.pdf)
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This June 1st update to the orders STOPPED all military assistance in its tracks UNTIL approval from Donald Rumsfeld (the "Secretary of Defense") could be granted -- which, by his own admission, it was not. Rumsfeld claimed total ignorance of the inbound aircraft that attacked the Pentagon (on the opposite side of the building complex, where a construction project had been underway).*
http://www.the7thfire.com/9-11/co-conspirator_of_9-11_stand_down.htm