English: This early illustration shows a concept for Apollo which would have employed either the direct ascent or Earth orbital rendezvous mode of operation. Shown here is the all-up configuration which allowed three astronauts to travel to the surface of the Moon for up to a week's stay and return using a single spacecraft. Note the towering height of the vehicle, its return upper stage and the now familiar command module which the crew would have used for their return to Earth once the upper return stage vehicle blasted off from the lunar surface. (Photo courtesy NASA.)