"Optical Space Surveillance" . "1975Z"^^ . . "SEMPER VIGILANS IN SINE ALTO - \"Ever Vigilant in the High Frontier\"" . . . . . "18th Space Surveillance Squadron"@en . . . . "The United States Air Force's 18th Space Control Squadron (18 SPCS) was a space surveillance unit located at Edwards AFB, California. Before its inactivation, the 18th SPCS operated optical sensors for the Ground-based Electro Optical Deep Space System (GEODSS)."@en . . "1966Z"^^ . .