Mercury-Atlas 9 was the fourth and final manned orbital flight of the Mercury program. The flight objectives were to:
(1) evaluate the effects on the astronaut of approximately one day in orbital flight;
(2) verify that man can function for an extended period in space as a primary operating system of the spacecraft; and,
(3) evaluate in a manned one-day mission the combined performance of the astronaut and a Mercury spacecraft specifically modified for the mission…