"Upcoming Rocket Launches: Delta IV Heavy and Falcon 9 Set for April Launch Attempts"

TL;DR
United Launch Alliance may aim for an April 8 launch for the last Delta IV Heavy rocket, but no official announcement has been made. The recent scrub was due to a gaseous nitrogen pipeline pump failure, highlighting concerns about aging infrastructure at NASA's Kennedy Space Center and Cape Canaveral Space Force Station. The potential launch date coincides with the Great American Solar Eclipse, and ULA's spokesperson has not provided updates. The company plans to replace the retiring Delta IV Heavy with the next-generation Vulcan rocket.
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