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This photo shows NASA's F-14 (NASA tail number 991; Navy serial number 157991) flying over Rogers Dry Lake, accompanied by a Navy F-14. NASA 991 was the research aircraft in a joint NASA/Navy program between 1979 and 1985. This looked at ways of improving the F-14's handling at high angles of attack, increasing spin resistance, reducing "wing rocking" (i.e. tilting from side to side), and improving aircraft recovery when it departed from controlled flight (e.g., entered a spin). A number of F-14s had been lost in spin accidents, resulting in the program.