U.S. Defense Secretary Ash Carter during a March 17 Senate Armed Services Committee hearing that opened with a request from Sen. John McCain to investigate controversial comments ULA's vice president of engineering made during a seminar at the University of Colorado, Boulder. Credit: DoD/Senior Master Sgt. Adrian Cadiz

WASHINGTON — The U.S. Defense Department has launched an investigation into comments made last week by a now-former United Launch Alliance executive.

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