From left to right, Staff Sgt. Luke Feilmeier, Staff Sgt. Andrew Ter Haar and Senior Airman Kyle Vander Molen, assigned to 185th Civil Engineer Squadron, shovel snow away from a runway cable barrier in Sioux City, Iowa, Jan. 10, 2016. The barrier system requires periodic testing and it can be used in an emergency to catch fighter aircraft. (U.S. Air National Guard photo by Staff Sgt. Daniel S. Ter Haar/Released)