There is No Such Thing as a Stupid Question?
When your grade school teacher told you that there was no such thing as a stupid question, he had obviously never met a truther. From another pseudo-academic post on 9/11 Blogger (complete with footnotes and everything!) emphasis mine.
HELICOPTER PILOTS WERE AWAY FOR WEAPONS TRAINING
According to the military newspaper Pentagram, Davison Army Airfield's principal missions include maintaining "a readiness posture in support of contingency plans," exercising "operational control" of the local airspace, and providing "aviation support for the White House, U.S. government officials, Department of Defense, Department of the Army, and other government agencies."  Stationed at the airfield is the 12th Aviation Battalion, which is the aviation support unit for the Military District of Washington. The battalion operates UH-1 "Huey" and UH-60 Black Hawk helicopters. 
This raises two key questions: Could 12th Aviation Battalion helicopters have helped protect the Pentagon on September 11, and, if they could, why didn't they?
OK, well I can see a couple of problems with this...