women currently serving here, an essential seat of u.s. and south korean operations and a prime target. >> we expect that north korea is going to target any of our military bases that are here in the south. >> what kind of threat could north korea present to the base here? >> we worry about their short-range ballistic missiles here and we know that they have chemical weapons at their disposal. >> reporter: they stay ready to fend off a ground invasion from north korean special forces, and to take the fight north from the air. >>, obviously, having that air to surface capability, being able to take out the long range artillery that would be bombing seoul. >> this is the third tour for colonel s colonel shoemaker. it's different. >> we know north korea has advanced its nuclear and missile capabilities. have you changed the way you do things at all? >> it is a mindset shift of why it is so important and the seriousness with which all of the airmen and soldiers here at