Charlie Stross@midgephoto Sprint carried a W66 enhanced radiation weapon—an early neutron bomb. The idea was that the neutron pulse from a near-miss would trigger a fizzle (premature, incomplete fission) in the ICBM warhead while it was still 30-40km above the city it was aimed at. Replacing a big H-bomb blast at ground zero with a window-rattler 20 miles up. Only it was far more expensive to add Sprint ABMs than it was for the Soviets to add extra warheads to their ICBMs.
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