Never been done, AFAIK.
However, it occurred to me that if a nation was cutting back its nuclear forces and had leftover ICBMs... Why throw them away? Put high-explosive warheads on them for very quick precision strikes on high-value targets. A bridge, a headquarters, a dictator's residence. If the impact is close enough, the target won't know the difference.
But I suppose maintenance costs were a factor; also, I suppose one would have to develop the HE warhead, with active homing (GPS?).
So too expensive, I guess.
However, it occurred to me that if a nation was cutting back its nuclear forces and had leftover ICBMs... Why throw them away? Put high-explosive warheads on them for very quick precision strikes on high-value targets. A bridge, a headquarters, a dictator's residence. If the impact is close enough, the target won't know the difference.
But I suppose maintenance costs were a factor; also, I suppose one would have to develop the HE warhead, with active homing (GPS?).
So too expensive, I guess.