He placed a call to Armstrong and Aldrin minutes after their landing (5)

I believe the answer is:

nixon

(Other definitions for nixon that I've seen before include "US president, d.1994" , "Thirty seventh US president" , "Disgraced US president" , "37th US President" , "President re-elected in 1972" .)

I've seen this clue in The New York Times.

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