If they were actually going to do an all out strike
Ignoring for the moment non state actors and covert attacks, if a nation gets to the point of overtly launching nukes at us they will launch all the land-based ICBMs they have. Wait, wait. I'm worried what you heard was, "they will launch a lot of ICBMs." What I said was, "they will launch all the land-based ICBMs they have."
Sure, they may keep some warheads stationed on boats and subs in reserve, but fixed installations are going to get plastered in the return volley anyway, so they will want to get as many in the air as possible.
A country like Russia with plenty of warheads will certainly target C&C and military bases both for us and our nuclear-capable allies, but I'm guessing they have tasked a good number to population centers and non-military logistical targets as well. I'm certain we plan on doing the same.