Some footage of the Hard Mobile Launcher being driven through its paces. The HML was a truck and trailer system… the trailer containing a single MGM-134a “Midgetman” Small ICBM. The idea behind this late 1980’s program was that the trucks would disperse around vast military reservations in the American West, and would be exceedingly difficult for the Soviets to effectively target. Once at the launch site, the trailer would lower itself and hug the ground. The truck would separate and head for the hills; the sloped sides of the trailer would, it was hoped, shield it from shock waves produced by nearby Soviet nuclear explosions. The trailer would then automatically raise and launch the missile.
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This particular HML is one of two very different Boeing designs, and currently resides at the USAF Museum in Dayton, Ohio.