Whenever the president travels, security is a prime consideration. Motorcade routes are kept secret, and premature release of information about a presidential trip aboard one of the twin Air Force One planes can result in the Secret Service canceling a visit.
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.
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