National Reconnaissance Office's KeyHole Imagery Satellite System

National Reconnaissance Office's KeyHole Imagery Satellite System is a series of US spy satellites designed to capture high-resolution photographic images from space. The system, which includes CORONA, ARGON, LANYARD, GRAB, POPPY, GAMBIT, HEXAGON, and QUILL satellite programs, has been used for decades-long intelligence gathering operations. The satellites are equipped with advanced imaging technology, allowing them to capture detailed photographs of targets on the ground. Despite efforts to declassify information about the system, many details remain classified due to concerns over protecting 'sources and methods' and justifying secrecy.