[RayChuang88]

There's a reason why they chose air burst over surface burst for most nuclear attacks--air burst causes more destruction over a wider area, necessary for attacking cities, above-ground industrial sites and large military formations. Ground burst (or very near ground burst where the warhead detonates maybe 100-200 meters above the ground) is used primarily to destroy fixed ICBM missile silos and underground command centers like the old SAC headquarters near Omaha, NE.

Interestingly enough, the now-mothballed NORAD command center at Cheyenne Mountain near Colorado Springs, CO would likely survive even a very close hit from a 1 MT nuclear blast, since it was built so deeply into the mountain and the fact the command center had extensive shock-proofing to resist the shock wave of a nuclear blast. That's why the Russians developed the gigantic R-36M (SS-18) missile that could deliver a 20 MT nuclear warhead--it was specifically designed to take out the Cheyenne Mountain facility.

[ExSES]

Interestingly enough, the now-mothballed NORAD command center at Cheyenne Mountain near Colorado Springs, CO would likely survive even a very close hit from a 1 MT nuclear blast, since it was built so deeply into the mountain and the fact the command center had extensive shock-proofing to resist the shock wave of a nuclear blast.

Though obviously obsolete, that facility is an engineering marvel! Visited it twice and was quite impressed with the structures (if not the technology which was very disappointing)...

[Kozak]

The command center at Cheyenne Mountain is still active.