 Complete the following phrase:  James Chipman Fletcher June 5, 1919  December 22, 1991 served as the 4th and 7th Administrator of NASA, first from April 27, 1971 to May 1, 1977, under President Richard M. Nixon, and again from May 12, 1986 to April 8, 1989, under President Ronald Reagan. As such, he was responsible for the early planning of the Space Shuttle program, and later for its recovery and return to flight after the 