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After delay, Delta IV Heavy lifts off for the last time

The storied career of the Delta family of rockets had to wait a little longer than planned to turn the page on its final chapter, but the last of its kind lifted off on the Space Coast on April 9.
A United Launch Alliance Delta IV Heavy, the largest and most powerful version of Delta rockets, launched from Cape Canaveral Space Force Station's Space Launch Complex 37 at 12:53 p.m. Eastern time. Dubbed the NROL-70 mission, the classified payload is for the National Reconnaissance Office.
The rocket had come within four minutes of the countdown clock hitting zero back on March 28, but teams discovered an issue with a pipeline of gaseous nitrogen used to supply the inert gas needed for safe operations on liftoff that took several days to remedy before ULA and its customer were OK to try again.