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Skybolt was going to be a bomber launched MRBM (range of 1,150 miles) with a single 1 MT device.
From launch to target would have been something like 8 minutes
It would have been a terribly escalating weapon system – forget IRBM/MRBMs in Turkey…a B-52 over southern Turkey, or a Vulcan over Denmark could have launched Skybolt and 8 minutes later it’d be dropping on Moscow.
To say nothing of how vulnerable Washington DC, London or Beijing would have been to a similar Soviet weapon system.
It was cancelled in favor of Polaris.
Edit – something to think about in regards to Skybolt. In the early 80s the US developed Pershing II and was an MRBM with a MIRV and had a flight time of under 8 minutes. It nearly had the range to hit Moscow (it could do Warsaw, Minsk, Kiev, Kaliningrad and the ABM sites west of Moscow) and the danger from it got the Soviets to call for the banning of nuclear SRBMs, MRBMs, IRBMs and land based cruise missiles in Europe
Skybolt would probably had spurred the same thing, fear and quick banning