The M2-F3 Lifting Body is seen here on the lakebed next to the NASA Flight Research Center (later the Dryden Flight Research Center), Edwards, California. Redesigned and rebuilt from the M2-F2, the M2-F3 featured as its most visible change a center fin for greater stability. While the M2-F3 was still demanding to fly, the center fin eliminated the high risk of pilot induced oscillation (PIO) that was characteristic of the M2-F2.