Air force takes one at random, transports it to Vandenberg sans warhead and lights the fuse to see if it works. Or at least they used to. I also heard that the

Air force takes one at random, transports it to Vandenberg sans warhead and lights the fuse to see if it works. Or at least they used to. I also heard that the Soviet equivalent of this random testing process was to simply retarget a random missile and launch it straight out the operational silo.