Hi Tahooey,

Missiles, specially bigger ones tend to make a significant launch signature to get them up to a high velocity. For this reason I don't think a missile would be launched from within the Pentagon grounds. If there was a missile used at the Pentagon, it is more likely to have been launched from far away. Once a missile has a high velocity, it can usually travel a significant distance without making a big visual signature by just gliding in.

My own pet theory is that a drone was used which had a large jet engine (larger than the small one used in a cruise missile and very different from solid rockets used in other guided missiles), and a bomb payload was launched from an airfield, guided in by remote, then crashed into the Pentagon via the official south of Citgo flight path. The drone would be timed to impact right after a large airliner type aircraft does a flyover of the Pentagon via the north of Citgo approach as witnessed by those interviewed. The drone can approach silently, gliding at high speed so that people will not notice it. People's attention would be at the big noisy and slower airliner which approaches, then flies over the Pentagon as the small drone hits it and creates a big explosion. The light poles are felled using explosives on their base to create the illusion that a large aircraft skimmed low into the building even though it was in fact a smaller aircraft flying above the light poles that did the damage to the building. This pet theory is, I think the only one compatible with the few security cam video frames released by the Pentagon (if one supposes they were genuine).

Why bother to use a drone and not just plant explosives and jet engine parts in the Pentagon? Well, the drone would take care of scattering "airliner" evidence into the Pentagon and still get people to work in their Pentagon offices unaware. Planting AlQuaeda passports on the street is easier than planting a large, heavy jet engine in the impact site.

An alternate is to do a flyover, use planted explosives to create both the external explosion and internal damage to the building, plant the engine parts or just fake the engine pictures and security cam video frames in the Pentagon.