A United Launch Alliance Delta IV Heavy rocket launches the NROL-91 mission for the U.S. National Reconnaissance Office on Sept. 24, 2022.

A United Launch Alliance Delta IV Heavy rocket launches the NROL-91 mission for the U.S. National Reconnaissance Office on Sept. 24, 2022. (Image credit: ULA)

The Delta IV Heavy has finished their work on the West Coast.

The vehicle's last-ever liftoff from the Golden State took place today.

At 6:25 p.m., the Delta IV Heavy took to the sky. On a mission called NROL-91, the launch took place from the Space Launch Complex 6. The craft that went up on NROL-91 is a mystery. The NRO builds and operates spy satellites in the U.S.

There is a reference to the Delta IV Heavy.

The NRO mission description states that it supports the overall national security mission to provide intelligence data to the United States' senior policy makers.

We don't know the exact location of the satellite, and ULA ended its website about seven minutes after launch, at the request of the NRO.

The Delta IV Heavy has been launched 14 times. The 233-foot- tall rocket is capable of lofting 62,540 pounds into the sky, more than any other currently operational rocket.

140,660 pounds can be delivered by the Falcon Heavy according to its website.

NASA has used the powerful booster on most Delta IV Heavy missions. The first flight test of the crew capsule of the Delta IV Heavy vehicles took place in 2004.

The Delta IV Heavy will be phased out by ULA and replaced by a new rocket called the Vulcan Centaur. There are two Delta IV Heavy flights that will be launched from Florida. If everything goes according to plan, those missions will lift off in two years.

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