Soldiers of the 2nd Armored Brigade Combat Team, 1st Infantry Division, watch a Kiowa helicopter land in the desert dust at the National Training Center, Fort Irwin, Calif., Feb. 21, 2013. Aviators and acquisition officials are exploring sensors, queing and control methods to better enable flying and landing in what is called a "degraded visual environment." (U.S. Army photo by E.J. Hersom)