The Mercury 13 were thirteen American women who in 1959–60 took part in a privately funded research program run by physician William Randolph Lovelace II, a private contractor to NASA, which aimed to
Seven surviving FLATs attending the STS-63 launch (1995). (From left to right: Gene Nora Jessen, Wally Funk, Jerrie Cobb, Jerri Sloan Truhill, Sarah Ratley, Myrtle Cagle, and Bernice Steadman.)
Jerrie Cobb operating the Multi-Axis Space Test Inertia Facility (MASTIF) at the Lewis Research Center in Ohio. The test simulated bringing a spinning spacecraft under control, and was one of many that the women of the Mercury 13 went through in order to qualify for space flight.