Apollo 11 astronauts

Astronaut Neil A. Armstrong, Apollo 11 commander, participates in simulation training in preparation for the scheduled lunar landing mission at Kennedy Space Center in this June 19, 1969 handout photo courtesy of NASA.[Photo/Agencies]

Astronauts Neil A. Armstrong, commander; Michael Collins, command module pilot; and Edwin E. Aldrin Jr., lunar module pilot, ride the special transport van over to Launch Complex 39A where their spacecraft awaited them in this NASA handout photo dated July 16, 1969.[Photo/Agencies]