SpaceX plans to launch 21 satellites for an advanced new U.S. military constellation this evening (Oct. 15), and you can watch the action live.

A Falcon 9 rocket is scheduled to lift off from California's Vandenberg Space Force Base today at 7:03 p.m. EDT (2303 GMT; 4:03 p.m. local California time), on a mission for the Space Development Agency (SDA).

You can watch it live via SpaceX's website or X account. Coverage will begin about 10 minutes before launch.

The launch will help build out the SDA's Tranche 1 Transport Layer (T1TL), a network of 126 satellites in low Earth orbit (LEO) that "will provide global communications access and deliver persistent regional encrypted connectivity in support of warfighter missions around the globe," agency officials wrote in a explainer.

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