Early ICBM Targeting

For some reason, if everything hit the fan in the mid 50s, clearly the US had the advantage. With that in mind, did Jupiters and Atlases have precision that would have been strategically useful, or were the bombers where most of the deterrence was coming from?
 
I imagine the early ICBMs are targeted on Moscow, Leningrad, Kiev, and similar large metropolitan (ie, easier to hit) areas, while SAC bombers are the primary and decisive force.
 
The Jupiter had a range of ~1500 miles and a CEP of 0.5 miles, it carried a 1.1 MT warhead and went in to service in the late 1950s. The Thor had the same range, CEP of 0.62 miles and carried a 1.4 MT warhead and went in to service in 1959. The Regulus sea launched cruise missile had a range of 575 mi and a CEP of about 3 mi and carried a 2 MT warhead and was in service beginning in 1955 or so (could be carried by submarines converted to this use or aircraft carriers. CEP (circular error probable) means that 50% of the weapons fall within a circles of this size centered on the aim point - it also means that 50% fall anywhere outside the circle from one inch to who knows where.
 
It's said that Curtis LeMay had a few different levels of devastation planned for various 2nd World Targets
Boulders
Rubble
Dust.

All with Bombers.
By time the first gen missiles were online, The USAF had almost a Teraton, not Megatons, planned for Moscow, and that didn't account for whatever Navy had targeted
 
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