Former U.S. President Richard M. Nixon welcomes the Apollo 11 astronauts aboard the U.S.S. Hornet in the Pacific Ocean in this July 1969 file photo. Already confined to the Mobile Quarantine Facility are, from left: Neil A. Armstrong, commander; Michael Collins, command module pilot; and Edwin E. Aldrin Jr., lunar module pilot. The 30th anniversary of the Apollo 11 mission is July 16 (launch) and July 20 (landing on the moon).

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