SpaceX's powerful Falcon Heavy rocket is expected to be back in action on Sunday. It is scheduled to launch from NASA's Kennedy Space Center (KSC) in Florida at 5:56 p.m. EST (2255 GMT), one day later than previously announced, on a classified mission for the U.S. Space Force called USSF-67.

Sunday's launch will be the fifth overall for the Falcon Heavy. The rocket debuted in February 2018 with a test flight that sent SpaceX founder and CEO Elon Musk's Tesla Roadster into orbit around the sun, with a spacesuit-clad mannequin named Starman in the driver's seat.

The Falcon Heavy launched again in April 2019 and June 2019, sending operational satellites aloft each time. But the rocket didn't lift off again until November of last year, on the USSF- 44 mission for the Space Force. The 40-month gap was due primarily to delays in getting customer payloads ready, according to space industry analysts.

The Falcon Heavy consists of three modified SpaceX Falcon 9 first stages, which are strapped together. The central booster is topped with a payload-carrying upper stage. Falcon Heavy's first stages are reusable, and the two side boosters will come back to Earth shortly after liftoff if all goes according to plan.

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