FORT MEADE, Md. (AP) — The warnings are strong and security is always tight, but most drivers are versed in the daily routine as thousands of employees and contractors stream through the closely guarded entrance to the National Security Agency. The ordinary start to the work week came to a violent halt Monday, though, when two men dressed as women and driving in a stolen, dark-colored SUV ignored officers' orders at the gate to the spy agency headquarters at Fort Meade in Maryland. Whether the pair wanted to breach the perimeter or the driver was desperate and confused in a security-sensitive area only added to the mystery of the officer-involved shooting. "The driver failed to obey an NSA Police officer's routine instructions for safely exiting the secure campus," Jonathan Freed, an NSA spokesman, said in a statement. Images from the scene showed emergency workers loading a uniformed police officer into an ambulance. Chain-link fences marked with restricted access signs and topped with barbed wire run along the perimeter of the campus. Posted signs inform drivers of various exits for the NSA and Fort Meade, including one for deliveries, another for a visitors' center and one designated for employees.