SpaceX launches 2nd classified mission for US Space Force in less than a week (photos)

SpaceX launched its second classified mission for the U.S. Space Force in less than a week tonight (Sept. 16).

A Falcon 9 rocket lifted off from California's Vandenberg Space Force Base today at 9:07 p.m. EDT (6:07 p.m. local California time; 0107 GMT on Sept. 17).

We don't know much about tonight's mission, which was called USSF-259. SpaceX's webcast didn't shed any light of note; it ended shortly after the Falcon 9's first stage returned to Earth for a landing in the Pacific Ocean atop a drone ship about 8.5 minutes after launch.

A SpaceX Falcon 9 rocket launches the USSF-259 mission for the U.S. Space Force from Vandenberg Space Force Base in California on Sept. 16, 2026. (Image credit: SpaceX)

That touchdown was the 13th for this particular booster, which is designated 1097. One of the booster's previous landings was a big milestone for SpaceX. This past April, B1097 pulled off SpaceX's 600th touchdown of an orbital-class rocket, during a launch that sent 25 of the company's Starlink internet satellites to low Earth orbit.

Tonight's mission was the second that SpaceX has flown for the U.S. Space Force in a six-day span: A Falcon 9 launched the similarly classified USSF-153 from Vandenberg on Sept. 10.

a rocket rests on the deck of a ship at sea — The Falcon 9's first stage rests on the deck of a drone ship shortly after launching the USSF-259 mission for the U.S. Space Force on Sept. 16, 2026. (Image credit: SpaceX)

Previous Booster 1097 missions

Sentinel-6B | Twilight | NROL-172 | Transporter-17 | 8 Starlink missions

Tonight's launch was SpaceX's 110th of 2026. The vast majority of the company's flights so far this year — 106 of them, in fact — have been performed by the workhorse Falcon 9.

The powerful Falcon Heavy has launched twice in 2026, as has SpaceX's next-gen megarocket, Starship. Both Starship liftoffs this year have been suborbital test flights. The next Starship launch, which is expected to occur in the next two weeks, will apparently take the vehicle orbital for the first time.

Editor's note: This story was updated at 11:50 p.m. ET on Sept. 15 with the new launch date of Sept. 16. It was updated agai at 9:28 p.m. ET on Sept. 16 with news of successful launch and rocket landing.

Michael Wall is the Spaceflight and Tech Editor for Space.com and joined the team in 2010. He primarily covers human and robotic spaceflight, military space, and exoplanets, but has been known to dabble in the space art beat. His book about the search for alien life, "Out There," was published on Nov. 13, 2018. Before becoming a science writer, Michael worked as a herpetologist and wildlife biologist. He has a Ph.D. in evolutionary biology from the University of Sydney, Australia, a bachelor's degree from the University of Arizona, and a graduate certificate in science writing from the University of California, Santa Cruz. To find out what his latest project is, you can follow Michael on Twitter.