Schneier on Security: Air Force One Security Leak: "Last week the San Francisco Chronicle broke the story that Air Force One's defenses were exposed on a public Internet site:

Thus, the Air Force reacted with alarm last week after The Chronicle told the Secret Service that a government document containing specific information about the anti-missile defenses on Air Force One and detailed interior maps of the two planes -- including the location of Secret Service agents within the planes -- was posted on the Web site of an Air Force base.

The document also shows the location where a terrorist armed with a high-caliber sniper rifle could detonate the tanks that supply oxygen to Air Force One's medical facility."

(Via Schneier on Security.)