Powerful Delta IV Heavy rocket launches US spy satellite on final flight from California - Space.com

Just two Delta IV Heavy missions remain now, both of which will launch from Florida.

The powerful United Launch Alliance (ULA) rocket launched a hush-hush satellite for the U.S.

The Delta IV Heavy took flight at 6:25 p.m.

The Delta IV Heavy: Powerful launch vehicle (reference).

Most Delta IV Heavy missions have carried NRO payloads to orbit, but NASA has employed the powerful booster as well.

Delta IV Heavy vehicles launched the space agency's Parker Solar Probe in 2018 and the first flight test of its Orion crew capsule in 2014.

ULA is phasing out the Delta IV Heavy in favor of a new rocket called the Vulcan Centaur, which could debut by the end of 2022!

Just two Delta IV Heavy flights remain, both NRO missions that will launch from Cape Canaveral Space Force Station in Florida.

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