In answer to Russell, the Office of Naval Intelligence was the only occupant of the re-furbished Pentagon Wing. See link below.
Here's the most comprehensive report I've seen yet to justify 9/11 as an inside job, and thankfully ties in the criminality of former CIA Director G. H. W. Bush as both Vice President (to clueless Reagan) and President.
"[N]ot only were the buildings targets, but ... specific offices within each building were the designated targets. ... [T]he attacks of September 11th were intended to cover-up the clearing of $240 billion dollars in securities covertly created in September 1991 to fund a covert economic war against the Soviet Union, during which 'unknown' western investors bought up much of the Soviet industry, with a focus on oil and gas. The attacks of September 11th also served to derail multiple Federal investigations away from crimes associated with the 1991 covert operation.
~ E. P. Heidner
The above explains motives. Below, we have evidence of the perpetrator's means.
NIST's Final Report on WTC-7 divides the first 18 stories of collapse into 3 stages. Stage 2 fell 8 stories or 100+ feet at "gravitational acceleration."
The ramifications of free-fall in any stage of collapse in any of the WTC buildings is additional energy sources (like explosives) had to be planted. Therefore the circle of 9/11 conspirators was much larger than 19 hijackers sitting in airplanes and included insiders.
The lack of an explanation for the breaking the laws of physics is admittedly but one piece of evidence of a crime, but it is a glaring one and one that can't be easily covered up by political appointees and discussion thread instigators.
This single free-fall feature brings awareness to the lies, cracks open the door in our nation's collective disbelief, and shuts down the coincidence theorists, who with the eagerness of those cashing government paychecks all too vocally & viciously lump everything about 9/11 -- including the advertising, the lead-up, the execution, the cover-up, and the distasteful follow-up -- as just "unfortunate coincidences."
For further information into this high school physics, http://www.youtube.com/ae911truth
"Perhaps the greatest fantasy of the present moment is that there is a choice here. We can look forward or backward, turn the page on history or not. Don't believe it. History matters."
~ Tom Engelhardt
"Truth, through her eternal laws, unveils error. Truth causes sin to betray itself... Even the disposition to excuse guilt or to conceal it is punished. The avoidance of justice and the denial of truth tend to perpetuate sin, invoke crime, jeopardize self-control, and mock divine mercy."
~ Mary Baker Eddy (ca. 1865)