Dr. Neil Armstrong (Left - Apollo 11 cmdr.), Dr. Harrison "Jack" Schmitt (Center Right - Apollo 17 LM cmdr.) & Captain Gene Cernan (Right - Apollo 17 cmdr.) tour Constellation Altair Lunar Lander mock-up. Rarely do we notice history until it becomes history. That's Wayne Ottinger between Dr. Armstrong and Dr. Schmitt, who worked with all three in engineering the Apollo Lunar Module.
BIG HAT TIP to ROB COPPINGER @ Hyperbola (Flight International)