BTW, a (possibly true) sea story from the Pentagon:
The plane hit in a mostly-Navy area.
Well, if you're going to be in a building that takes a catastrophic impact that starts a major CONFLAG, best to be there with a bunch of sailors. The US Navy has two official religions: damage control and firefighting. Everyone organized into teams to fight the fires, communicate with other teams, and rescue trapped or injured personnel. They couldn't do it for very long, but the word is that "dozens" of people were saved by the teamwork and refusal to quit shown by our sailors. But the fires were too intense, and the tools at hand too small, so everyone had to fall back pretty quick.
Around that point, Secretary Rumsfeld went towards the damaged area of the building to get a first-hand look. A Marine Gunnery Sergeant, headed the other way, bellowed, "You are in the Presidential Line of Succession, GET YOUR (Biblical beast of burden) TO A SECURE AREA NOW!
Word is Rummy just made a U-turn and beat feet. You don't argue with a senior Marine Corps noncommissioned officer, even if you ARE the SECDEF.