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. Police fired on the SUV, which then rammed into a police vehicle. One suspect was killed. The second suspect was injured, as well as a police officer.
Whether the pair wanted to breach the perimeter or the driver was desperate and confused in a security-sensitive area added to the mystery. The FBI's Baltimore field office said it was investigating the "shooting incident'' and did not believe it was related to terrorism.
Authorities say the cross-dressing men stole the SUV Monday morning from a hotel in Jessup, Maryland, and ended up about seven miles (11 kms) away at the NSA gate at Fort Meade, a sprawling Army post.
"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. The vehicle failed to stop, then "accelerated toward an NSA Police vehicle blocking the road. NSA Police fired at the vehicle when it refused to stop. The unauthorized vehicle crashed into the NSA Police vehicle.''
Images from the scene showed emergency workers loading a uniformed police officer into an ambulance. Nearby were the dark-colored SUV and a white SUV emblazoned with "NSA Police,'' both heavily damaged.
It's not the first time someone has disobeyed orders at an NSA gate. In July, a man failed to obey an NSA officer's command to stop as he approached a checkpoint. The man drove away, injuring an NSA officer and nearly striking a barricade. He was later arrested and is awaiting trial on federal charges.
Earlier this month, police captured a man accused of firing at a building on the NSA campus. The man, who was also accused of shooting at vehicles, told police he heard voices.
Fort Meade is home to the NSA, the Defense Information Systems Agency and the U.S. Cyber Command. About 11,000 military personnel and about 29,000 civilian employees work on the property.