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Key military personnel who were responsible for protecting the U.S. against the 9/11 attacks may have been seriously hindered in their ability to respond because of a large-scale air defense exercise they were participating in when the attacks occurred. Evidence indicates that the personnel, whose responsibilities included ordering fighter jets into the air to intercept the hijacked planes, were unclear about what was "real-world" and what was "exercise." They may have been led to believe that the terrorist attacks were just simulated scenarios.