Harrison Schmitt credits the image to the entire Apollo 17 crew. While on the Moon's surface, Schmitt — the only geologist in the astronaut corps — collected the rock sample designated Troctolite 76535, which has been called "without doubt the most interesting sample returned from the Moon". Among other distinctions, it is the central piece of evidence suggesting that the Moon once possessed an active magnetic field. As he returned to the Lunar Module before Cernan, Schmitt is the next-to-last person to have walked on the Moon's surface. After the completion of Apollo 17, Schmitt played an active role in documenting the
United States Astronaut Hall of Fame Chaffee, the third astronaut killed in the Apollo 1 fire and the only unflown astronaut in the Hall; Harrison Schmitt, the first scientist and next-to-last person to walk on the Moon; and Jack Swigert and Fred Haise, the Apollo 13 crewmembers not previously inducted. Over two dozen astronauts from the Space Shuttle program have been inducted since 2001. Among these are Sally Ride, the first American woman in space; Story Musgrave, who flew six missions in the 1980s and 90s; and Francis Scobee, commander of the ill-fated final "Challenger" mission. The 2010 class consisted of Guion Bluford, Jr., Kenneth Bowersox,