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Summary

The MH-6 Little Bird (also known as Killer Egg) and its attack variant, the AH-6, are single-engine light helicopters used for special operations aviation in the United States Army. Originally based on a modified OH-6A, it was later based on the MD 500E, with a single five-bladed main rotor. The newest version, the MH-6M, is based on the MD 530F and has a single, six-bladed main rotor and four-bladed tail rotor.

Sources

http://www.specialoperations.com/Army/160th_SOAR/MH6

http://en.wikipedia.org/wiki/MH-6