SpaceX flew a classified payload to low Earth orbit for the U.S. Space Force on September 10, 2026, lifting off from Space Launch Complex 4E at Vandenberg Space Force Base during a three-hour window that opened at 8:37 a.m. PDT (11:37 a.m. EDT / 15:37 UTC). The mission, designated USSF-153, carried an undisclosed number of satellites; neither SpaceX nor the Space Force has released details about the payload's purpose or orbital parameters★. According to NASASpaceFlight.com, the Falcon 9 flew a southeasterly trajectory following liftoff. The mission was previewed by multiple independent outlets ahead of launch.
A Classified Mission Amid a Commercial Surge
USSF-153 arrives in the middle of one of SpaceX's most active stretches of West Coast operations. The company has deliberately shifted all Falcon 9 Starlink launches from Florida to Vandenberg, freeing its Cape Canaveral infrastructure to support the development and eventual debut of the Starship-Super Heavy system. That strategic realignment is evident in the cadence at Vandenberg in recent weeks: a Starlink mission flew on August 25, another on September 1, and a third on September 5 — the 80th Starlink mission SpaceX had executed in 2026 at that point. USSF-153 slotted into this same launch complex just five days later★.
The pattern underscores how thoroughly SpaceX has woven its military and commercial programs together at a single site. Classified Space Force payloads now launch from the same pad and often within days of routine broadband replenishment runs, a tempo that reflects both the Space Force's growing reliance on SpaceX and the company's operational efficiency with the Falcon 9 booster. The classified nature of the USSF-153 payload is consistent with standard Space Force practice for sensitive national security missions, keeping specifics about the constellation or orbital shell out of the public domain.
★ AI inference: One or more analytical conclusions in this article were drawn by the AI from cited facts and are not directly stated in the cited sources.