U.S. Defense Secretary Jim Mattis delivers a keynote Sept. 20 at the Air Force Association's Air Space Cyber conference in National Harbor, Maryland. Credit: DoD video
Richard Shelby Senate
Senate Armed Services Committee Chairman John McCain (R-Ariz.) will hold a hearing Jan. 27 on Russian rocket engines. McCain has been a vocal critic of the Air Force's reliance on the RD-180 engine. Credit: Roll Call video capture
Lightfoot House hearing
Close-up of the Asteroid Redirect Vehicle departing the asteroid after capturing a boulder from its surface. Credit: NASA artist's concept
Senate Armed Services Committee Chairman John McCain (R-Ariz), center, wants a legal opinion on whether the purchase of Russian rocket engines violates U.S. sanctions. Credit: U.S. Air Force photo/Scott M. Ash
George Nield
U.S. Senator Barbara A. Mikulski (D-Md.) speaks at an event to commemorate the 25th anniversary of the Hubble Space Telescope,  April 21, 2015 at the Capitol Hill Visitor Center. Credit: NASA/Aubrey Gemignani
The NRO's classified NROL-67 mission launched in 2014 aboard a United Launch Alliance Atlas 5 rocket.
Orbital ATK JPSS

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