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construct a timeline of neil armstrong's most significant accomplishments.
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1952 – enrolls in the united states naval academy 
1955 – completes his first naval flight 
1962 – graduates from the university of southern california with a master's degree in aeronautical engineering 
1966 – joins nasa as a civilian astronaut 
1969 – walks on the moon as commander of apollo 11 
1971 – retires from nasa 
1982 – becomes a professor of aerospace engineering at university of cincinnati
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