Illustrations of a Martin concept from 1961 called “DEIMOS” (Development and Investigation of a Military Orbital System). Pitched to the Air Force, this entailed a modified Titan II launch vehicle, a standard cargo hauler and a scaled-up two-man Mercury capsule (this was before Gemini was finalized). The result was something akin to a smaller version of the later MOL (Manned Orbiting Laboratory). The Titan II described here (modifications unknown) could put a 10,000 pound payload into a 300 nautical mile orbit.
Capabilities and roles of DEIMOS were not provided, but it would presumably serve much the same role as MOL, though simpler and lighter weight: basic science as well as reconnaissance and intelligence gathering. The claim as of August 1961 was that if work began soon DEIMOS could begin flying in 1963.