S72-48888 (September 1972) --- Astronaut Eugene A. Cernan (left), commander, and scientist-astronaut Harrison H. Schmitt, lunar module pilot, simulate collecting lunar samples during extravehicular activity training at the Kennedy Space Center, Florida. Astronauts Cernan, Schmitt, and Ronald E. Evans, command module pilot, are the prime crewmen of the Apollo 17 lunar landing mission.