Originally Posted by
old,not bold
One reason might be simply that the silo is in a known location and can't duck.
same applies to a B-70 Airbase - they couldn't operate from any old field. That's why I was asking about endurance - if its limited then they have to spend a lot of time on the ground on Quick Alert. Also given the unit cost you could probably buy a lot of Minutemen silos for one ICBM equipped B-70