Mac McGarrigle's Lifting Body
Model Rocket Technology.
The M2-F2/3 Lifting Body

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The M2-F2
The Northrop M2-F2 was a heavyweight lifting body based on studies at NASA's Ames and Langley research centers.  Built by the Northrop Corporation in 1966. The "M" refers to "manned" and "F" refers to "flight" version.

The M2-F3
The Northrop M2-F3 was rebuilt from the M2-F2 at Northrop and re-designated the M2-F3 after the M2-F2 crashed at the Dryden Flight Research Center in 1967.  It was modified with an additional third vertical fin - centered between the tip fins - to improve control characteristics.