GPS 3 satellite (Lockheed Martin)
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Caption: GPS 3 satellite

Credit: LOCKHEED MARTIN ARTIST'S CONCEPT
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KANDAHAR AIRFIELD, Afghanistan -- Air Force Capt. Bryony Veater, Space Liaison Officer and Space Weapons Officer embedded with the 807th Expeditionary Air Support Operations Squadron, looks a Defense Advanced GPS Receiver Nov. 23, 2011. Over the past six months, Veater has been training U.S. and coalition forces how to best utilize space into ground warfare. (U.S. Air Force photo by Staff Sgt. David Carbajal)
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A U.S. Air Force airman plugs coordinates into a Defense Advanced GPS Receiver, or DAGR. (Credit: U.S. Defense Department)
GPS 3 satellite (Lockheed Martin)
GPS 3 satellite. Credit: Lockheed Martin
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"We need to control the manufacture and web sale of [GPS]  jammers, which is pretty unabated right now," retired U.S. Coast Guard Adm. Thad Allen testified March 29 before a joint hearing on space threats and the implications for homeland security.  Credit: House Homeland Security Committee video
GPS 3. Credit: Lockheed Martin
Artist's rendering of a GPS Block 2F satellite. Credit: Boeing.
Frank Kendall, the U.S. undersecretary of defense for acquisitions, technology and logistics, addressing the Washington Space Business Roundtable Feb. 23, 2016. Credit: SpaceNews/Mike Moser

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