Master Sgt. Paul Lanoue, left, Master Sgt. Christopher Davidson, center, and Master Sgt. Patrick Hill, right, first sergeants at Ellsworth Air Force Base, S.D., assemble a makeshift bridge during the Leadership Reaction Course at the South Dakota National Guard West Camp Rapid training facility, Rapid City, Sept. 15, 2016. Many of the obstacles required swift and creative thinking in order to achieve the given task. (U.S. Air Force photo by Airman 1st Class Donald C. Knechtel)