Coordinating with radio stations in California, Spain and Australia to provide 24-hour communications and telemetry data during the Apollo missions, "Houston"-as the astronauts called Mission Control-is nearly as famous as any of the people who flew to the moon, and Gene Kranz was one of the most influential people in that room".
'But they also know that there is hope for mankind in their sacrifice'.
"Apollo 11 was my first opportunity to be there at liftoff", she added.
"Others will follow, and surely find their way home".
'The men would either have to starve to death or commit suicide'. But Aldrin and Armstrong "were the first, and they will remain the foremost in our hearts".
Safire noted that following the sombre address, the president had planned to give a modified burial to the astronauts at sea in a public ritual that commended their souls to "the deepest depths".
Aldrin - the second man to walk on the moon after Neil Armstrong, who died in 2012 at age 82 - certainly stood out at the event, sporting a suit covered in rocket ships, a silver bowtie, pink button down and American flag socks.
Vintage Roger Federer holds off Rafael Nadal to reach Wimbledon final
With the Spaniard making it a match , Djokovic flapped his arms at the capacity crowd in an effort to coax a show of support. The first-set battle seemed to have taken the wind out of Federer, who seemed to unravel in a series of errors.
Despite some setbacks (while moving about the lunar module cabin, one of the astronauts accidentally damaged a circuit breaker that controlled the craft's engines), Aldrin and Armstrong successfully rendezvoused with Collins above the moon, and all three made it safely back to Earth.
Mr Collins said he wished his two moonwalking colleagues could have shared the moment at Kennedy Space Centre's launch complex 39A, the departure point for the first moon landing.
Four days later, Armstrong and Aldrin became the first humans to set foot on the lunar surface.
Apollo 18, 19 and 20 were also scheduled to head to the Moon, with the latter due to land in July 1974.
The last manned mission to the Moon was Apollo 17, crewed by Eugene Cernan, Ronald Evans and Harrison Schmitt, which touched down in the Taurus-Littrow valley on December 11, 1972.
Morris said he continued to work on the team for most Apollo missions before the space program ended.
The historic and successful Apollo 11 mission could have gone very differently.
To commemorate this celebrated day, UCR secured direct accounts, examined old interviews and poured through historical archives to create a snapshot showing where some of rock's greatest acts were when man landed on the Moon.