The Joint Chiefs of Staff holds a large, worldwide exercise called Positive Force, which focuses on the Defense Department’s ability to conduct large-scale military operations and coordinate these operations. [Chairman of the Joint Chiefs of Staff, 8/14/2000 ] The 2001 Positive Force exercise is a “continuity of operations exercise,” meaning it deals with government contingency plans to keep working in the event of an attack on the US. [Guardian, 4/15/2004] Over a dozen government agencies, including NORAD, are invited to participate. The exercise prepares them for various scenarios, including non-combatant evacuation operations, cyber attacks, rail disruption, and power outages. It includes “a series of simulated attacks against the maritime, surface and aviation sectors” of America’s national security transportation infrastructure. [US Congress, 5/8/2001; Provider Update, 10/2001; GlobalSecurity (.org), 6/9/2002] Apparently, one of the scenarios that was considered for this exercise involved “a terrorist group hijack[ing] a commercial airliner and fly[ing] it into the Pentagon.” But the proposed scenario, thought up by a group of Special Operations personnel trained to think like terrorists, was rejected. Joint Staff action officers and White House officials said the additional scenario is either “too unrealistic” or too disconnected to the original intent of the exercise. [Air Force Times, 4/13/2004; Boston Herald, 4/14/2004; Washington Post, 4/14/2004; New York Times, 4/14/2004; Guardian, 4/15/2004]