symbolic victory and a positive sign. it's cautious optimism. isis wants the caliphate. they want to own that territory and lure in mesh american forces on the ground to fight us in the ground, on the battlefield. to show isis they're not afraid, they will press on. with the help of advisers and air power, we can stymie the satellite line and the western front that isis partially controls. >> it's very difficult, though, to pin isis down. they are very good at changing tactics and melting away, at hitting back and hitting back hard. what do you expect to happen next? >> i expect the same thing that got the job done for us which insured success which was going thousands house, door to door, rooting them out. showing that we are advanced with tactics, and we're there for the long run to win that fight. the iraqi army has to prove themselves day in and day out. if we don't press isis, they're