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McDivitt commanded two early Gemini and Apollo missions in the 1960s that played a key role in preparing for the moon landing in 1969.
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NASA Administrator Bill Nelson said the uptick in activity, including launches from private sector companies, will usher in a "whole new era of space activity."
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Collins was the crew member who stayed in orbit on the Apollo 11 command module while Neil Armstrong and Buzz Aldrin walked on the moon. Later he oversaw building of the National Air and Space Museum.