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M-1Michigan Highway
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6: If X-2 passes to X-3 on the perimeter, M-1 has to slide out of the rectangle to cover him and M-3 must replace him in the corner.
The M-1 was never just a weapon; it was also a bail-out package.
When the M-1 program began in 1972, the Armyhad already spent the better part of a decade and well over half a billion dollars trying to replace its M-60--with nothing to show for the effort.
Each bidder would have to design, develop, and actually build a prototype M-1.