they know that they don't want to kick it and then have them tme back. tey want to destroy them. >> reporter: we joined the soldiers of the first strategic dorce advisory brigade as they prepared to head outside the wire. they're among 14,000 u.s. troops still serving in tan.anistan. and a military convoy like this is the only way u.s. forces can get around. as always, the soldiers here iove been cautioned to be on the lookout for people opening fire, an i.e.d., a roadside bomb, or vehicle bomb en route to the location. its company commander kirby robinson's second tour of afghanistan, and the major sixth combat deployment. ( gunfire ) this is what combat used to mean for u.s. forces here. this is what it looks like now. w.new way of fighting an old war. 20 miles from the front line, u.s. army officers using armed drones and intelligence to monitor afghan forces taking the fight to isis. over on the afghan side,