The U.S. Air Force is gearing up to set another round of firsts with the pending third launch of the Boeing X-37B, but what those milestones may be will remain as much of a mystery as it has been with the recently completed second flight. Looking relatively pristine after its fiery reentry through the atmosphere, the second X-37B Orbital Test Vehicle (OTV-2) completed a record-breaking 15-month classified mission with a textbook autonomous landing at Vandenberg AFB, Calif., on June 16. ...

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