>> go, go, go! >> reporter: urban warfare training. one of a series of crucial exercises soldiers like will mclean undergo at fort leonardwood, missouri, to become army combat engineers. learning how to secure buildings in hostile regions is key. >> come on. get in the fight! >> reporter: nearly 13 weeks into his training, will is beginning to learn how to become a leader. >> coming out! >> go right. >> reporter: but on this day, it's hard for all of them to stay on top of their game. >> get from behind this corner, son. you can't shoot around a corner. you're not superman. >> reporter: why is this day a distraction? now that will has completed basic, and is wrapping up specialized training, he and the others will get orders for their first station. it's where the army will send new soldiers for more training before many are deployed to afghanistan.