Space Development Agency priorities shown in a presentation April 9 by then SDA Director Fred Kennedy.

WASHINGTON — Undersecretary of Defense for Research and Engineering Mike Griffin and his deputy Lisa Porter submitted letters of resignation to Defense Secretary Mark Esper on June 23 and plan to leave their posts by July 10.

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Sandra Erwin writes about military space programs, policy, technology and the industry that supports this sector. She has covered the military, the Pentagon, Congress and the defense industry for nearly two decades as editor of NDIA’s National Defense...