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CHANTILLY, Va. – The National Reconnaissance Office—in partnership with the United
Launch Alliance and the U.S. Space Force’s Space Launch Delta 30 and Space Systems
Command—marked the end of an era with the NROL-91 mission today at 3:25 p.m. Pacific
Time / 6:25 p.m. Eastern Time. This was the fifth and final United Launch Alliance Delta IV
Heavy rocket to launch from Vandenberg Space Force Base since 2011.
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