It took 400,000 people to put Apollo 11’s Neil Armstrong and Buzz Aldrin on the moon a half-century ago. That massive workforce stretched across the U.S. and included engineers, scientists, mechanics, technicians, pilots, divers, seamstresses, secretaries and more who worked tirelessly behind the scenes to achieve those first lunar footsteps . Some of them will be taking part in festivities this week to mark the 50th anniversary .