[tsotha]

I wonder what they're using for guidance. GPS and inertial guidance aren't accurate enough and anyway aren't useful against moving targets.

That leaves laser guidance kits, which tend to be pretty expensive. Probably takes more than one attempt on average, too.

On the other hand, you probably don't need to worry much about temperature and humidity when you store concrete munitions. Or maybe they mix up a batch of bombs before the sortie - "You can't launch yet. The concrete isn't dry."