anything can happen. >> cnn has been following the story of army sergeant first class randy shourder who recently returned to afghanistan for his third tour of duty. shortly after his arrival sergeant shourder and his men patrolled outside the protective perimeter of the base. this is some dangerous territory. our jason carroll joined this patrol. >> everybody is going to get hands on on the radio. >> reporter: sergeant shourder hasn't been on the ground in southeastern afghanistan for two hours, and already we found him at work. testing weapons. quickly getting gear and his platoon's armored vehicles ready to roll. >> it's a moment where you've got to get a lot done in a short period of time. >> that's correct. a frustrating time. >> reporter: shortly after arriving, his orders changed. his platoon made up of 14 soldiers convoyed to a much