>> -- u.s. army artillery firing into mosul. >> okay. before we get to that just how do they use the air power do you, do you like force those isis fighters out of wherever they're hiding and then the air power comes in to play? how is that used? >> well, it's up to the commander on the ground. but normally, you employ it before you get to where you want to go. soften up the area, try and take out key targets that you know about, and then as targets present themselves you alter the air strikes to where you want them. it's a pretty dynamic process. and it can be very effective. and that's what makes it effective is its flexibility. if you see a target develop you can immediately put air power on it. there are aircraft virtually orbiting standing by. so it's a pretty fast moving process. but it requires somebody on the ground to control that. and we have that now with the iraqi forces, forward and the peshmerga. >> okay. and just a final question because we have this election going on, and there's -- there's been talk especially from donald trump that we're presenting our