This undated image made available by the National Reconnaissance Office is a declassified image of a man standing next to a satellite control section from the Hexagon program. DANBURY, Conn. – For more than a decade they toiled in the strange, boxy-looking building on the hill above the municipal airport, the building with no windows (except in the cafeteria), the building filled with secrets. They wore protective white jumpsuits, and had to walk through air-shower chambers before entering the sanitized "cleanroom" where the equipment was stored. They spoke in code. Few knew the true identity of "the customer" they met...