KH-10 Dorian

The KH-10 (BYEMAN codename DORIAN) was the classified designation for the reconnaissance mission and equipment of the experimental Manned Orbiting Laboratory (aka MOL), also inaccurately referred to as Gemini B

Mission
The system's mission was obviously optical (regarding the presence of the mirrors), but also had a secondary signals intelligence collection mission.

History
A single, unmanned launch of Gemini-B/MOL verified the feasibility of the system. Subsequently the program was cancelled, and no additional hardware flew in space.

Disposition
After DORIAN was cancelled, Project COLT provided six (6) surplus 72-inch optical mirrors to the Smithsonian Institute/University of Arizona's Multiple-Mirror Telescope. The mirrors were constructed by Corning and used honeycombed borosilicate to reduce the weight.