Sure, Check THIS, the Boulder impact analysis that Cabbage Patch did for "It Only Takes One."
From the rendezvous point at/near Genesee Park, follow I-70 West... Just a bit South-West of central Utah, I-70 ends ("T's off") at I-15. Follow I-15 South to Exit 189 in California. That's Fort Irwin Road.
That's the direct and easy to follow route, though I think it would be likely that the evacuation convoy would have gone cross country directly to Irwin from the Baker area. The only point of consequence is that I-15 runs right through the heart of Las Vegas...
(Though while checking this out, I learned that Nellis AFB in Vegas has, among other aircraft, A-10's... hey Chief Muldoon, how do you feel about fixed wing?)
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