A Delta 4 Heavy rocket carrying a payload for the National Reconnaissance Office lifts off June 11 from Cape Canaveral Air Force Station. Credit: Josh Dinner/SpaceNews
Although ULA is phasing out its single-stick Delta 4 rocket (above), the company's Chief Executive Tory Bruno said the Delta 4 Heavy variant will be available as long as the U.S. Air Force wants it. Credit: ULA
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The Geosynchronous Space Situational Awareness Program (GSSAP) launch. Credit: ULA
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OCO-2. Credit: Jet Propulsion Laboratory
Delta 4 rocket
A software and security update by Lockheed Martin will improve the U.S. Air Force's GPS ground station used to communicate with the GPS 2F satellites, pictured above.
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Delta 4 WGS launch
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