In the missile control room scene (when Garcia forces the soldier to insert his key to enable the nuke) debris is clearly visible on the floor. This is debris caused by the attack on the base which does not take place until later in the episode.
During the attempted missile launch, the status light clearly shows DEFCON (Defense Condition) 2. Doctrine requires that DEFCON 1 (war) be the status before the launch of nuclear weapons.
The launch facility, although not realistic, still is clearly an underground bunker with walls of reinforced concrete. It was able to withstand an airstrike. Frank's cell phone could never work inside it.