The U.S. Air Force's upcoming fifth and sixth satellites in its missile warning constellation will have a new satellite bus, Lockheed Martin's A2100.

A top Lockheed Martin space executive said the Air Force might need to build two more protected communications and two more missile-warning satellites as it transitions to next-generation architectures for both programs.

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Mike Gruss is the chief content and strategy officer at SpaceNews. From 2013 to 2016 he was a senior reporter at SpaceNews covering military space. Previously, he was editor in chief of Sightline Media Group and worked as a reporter and columnist for...