Tom Neal sent along this info: This was a 1963 GE proposal for a 2-man expedition to Mars. A single NERVA engine with jettisonable fuel tanks provided propulsion for the round trip. Crew quarters and a "storm cellar" were provided just aft of the Gemini lander.
Attaining Mars obit, the crew transferred into the "Winged Gemini". The lander's engine was used to de-orbit followed by winged atmospheric braking. At a low altitude (good luck guys...), the ship manuevers to a "tail-first" attitude and lands vertically using the rocket engine.
After a stay of only a few days, the upper section of the lander returns to rendezvous with the main ship. The nuclear engine is again used to return to an Earth parking orbit. No mention of how the crew returns to terra firma.
Thanx to Steven Jones for providing these illustrations... sorry, but copies of these are not available.