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Live coverage of the countdown and launch of a United Launch Alliance Delta 4-Heavy rocket with the National Reconnaissance Office’s NROL-71 payload. Text updates will appear automatically below. Follow us on Twitter.

ULA’s live video coverage of the Delta 4 launch will begin Dec. 19 at 5:24 p.m. PST (8:24 p.m. EST; 0124 GMT on Dec. 20).