Members of the 727th Expeditionary Air Control Squadron work on a TPS-radar system in Southwest Asia. The TPS-75 is being replaced by a new Three-Dimensional Long-Range Radar, or 3DELRR, system that will serve as the Air Force's primary long-range, ground-based sensor for detecting, identifying, tracking and reporting aerial targets. A contract was awarded to Raytheon for the engineering, development and manufacturing of the system on Oct. 6, 2014. (U.S. Air Force photo/1st. Lt. Victoria Porto)