Editor's Note: We're tracking three recruits from their final days as civilians through to deployment. It's an unprecedented look inside the life of a soldier. This is part three of the American Morning original series "A Soldier's Story," and don't miss part one and two here. [cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2009/images/12/15/mclain.rifle.art.jpg caption="Army recruit Will McLain is in … Continue reading A Soldier's Story: Army recruits tested in gas chamber