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The U.S. Space Force confirmed Tuesday that a Falcon Heavy launcher placed two main payloads and at least three smaller rideshare satellites directly into a high-altitude geosynchronous orbit after liftoff from Florida, an achievement that checks off one of the final unproven capabilities for SpaceX’s rocket family.

SpaceX’s Falcon Heavy, the world’s most powerful operational launch vehicle, lifted off from Kennedy Space Center in Florida at 9:41 a.m. EDT (1341 GMT) Tuesday on a mission to deliver two U.S. Space Force satellites and multiple rideshare payloads into geosynchronous orbit, a journey that will take about six hours for the rocket’s upper stage. The Falcon Heavy’s two side boosters successfully returned to Cape Canaveral for landing about eight minutes after liftoff.

The first Falcon Heavy rocket flight since 2019 is scheduled Tuesday to kick off SpaceX’s longest-duration launch mission to date, a roughly six-hour climb into geosynchronous orbit more than 20,000 miles over the equator with a bundle of payloads for the U.S. Space Force. The powerful rocket’s two reusable side boosters will return to Cape Canaveral for landing.

NASA says the Psyche mission, a robotic asteroid explorer that missed a launch opportunity this year due to software testing problems, has been rescheduled for liftoff from Florida in October 2023 on a SpaceX Falcon Heavy rocket.

SpaceX fired up 27 engines on a Falcon Heavy rocket Thursday night at Kennedy Space Center, sending a rumble across the spaceport in a hold-down test-firing before a launch next week for the U.S. Space Force.