A AN/TPS-75 radar rests on the back of a transport vehicle at the Alpena Combat Readiness Training Center, Mich., July 29, 2015. The AN/TPS-75 radar is capable of providing coverage of more than 200 nautical miles in every direction and detecting aircraft as high as 95,000 ft. Following release of a contract award May 11, 2017, the radar, dating to the Vietnam War era and containing vacuum tube technology, will be replaced by Raytheon Co. built three dimensional expeditionary long-range radars by 2028.  (U.S. Air National Guard photo by Senior Airman Ryan Zeski/Released)
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