Watch a replay of our live coverage as a United Launch Alliance (ULA) made an attempt to launch its Delta 4 Heavy rocket for the final time from Space Launch Complex 37 at Cape Canaveral Space Force Station. The launch was scrubbed due to a nitrogen pipeline issue at the spaceport. The threecore liquid hydrogen fueled rocket is carrying a top secret payload for the U.S. military's spy satellite agency, the National Reconnaissance Office (NRO).

Commentary is provided by Spaceflight Now's Will RobinsonSmith. It will be the 16th launch for the Delta IV Heavy rocket.

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