Status: Development ended 1959.
In 1958 H. Kurt Strass and Caldwell C. Johnson of NASA's Space Task Group at Langley Field, Virginia.sketched a spacecraft design concept for a two-man orbiting laboratory to be launched by an Atlas-Vega booster. This was one of the earliest sketches of a two-crew Mercury follow-on. The Vega stage was dropped in favour of the Agena a year later, and a similar one-crew Mercury-Agena space station was proposed by McDonnell some years later.
Milton W. Rosen of NASA Headquarters proposed a plan for obtaining high-resolution photographs of the moon. A three-stage Vega would place the payload within a 500-mile diameter circle on the lunar surface. A stabilized retrorocket fired at 500 miles above the moon would slow the instrument package sufficiently to permit 20 photographs to be transmitted at a rate of one picture per minute. Additional Details: here....