SpaceX launches classified USSF-259 mission from Vandenberg; Falcon 9 first stage returns to droneship

# What happened

# Mission profile and orbit

The flight departed on a southerly trajectory and deployed a classified payload into low Earth orbit with an inclination of roughly 80 degrees to the equator. Public details about the payload are limited because of its national security designation.

This mission, designated USSF-259 in public reporting, appears in U.S. Space Force procurement documents as TH-1. It follows two other recent Space Force missions procured under the National Security Space Launch (NSSL) Phase 3 Lane 1 contract. Those earlier flights were identified as R1 and R2 in public documents and each carried 23 satellites. A mission labeled R-3 was scheduled for Sept. 27 according to the same set of documents.

# Rocket and booster recovery

SpaceX flew the mission on Falcon 9 first stage B1097, logging the booster's 13th flight. Nearly 8.5 minutes after liftoff, B1097 successfully touched down on the droneship Of Course I Still Love You positioned in the Pacific Ocean. That landing marked the 224th recovery made by that droneship and the 661st Falcon booster landing recorded by SpaceX.

# Sequence of events leading up to launch

# Context within the Space Force and SpaceX cadence

USSF-259 is one of several classified launches Space Systems Command has contracted using Falcon 9 under NSSL Phase 3 Lane 1. Spaceflight reporting places USSF-259 alongside USSF-366 and USSF-153, the latter two having flown in August and earlier in September. SSC has generally declined to disclose specifics about these flights beyond basic trajectory and contract identifiers.

# Immediate post-launch information available

Because the mission carries classified hardware, SpaceX did not publish a detailed public timeline of upper-stage events or satellite deployments. Publicly available operational notes include liftoff time, trajectory (southbound), the orbit inclination estimate, the booster identity and its successful recovery on the droneship.

# What to watch next

Related contract missions remain scheduled through late September, and public procurement documents list additional flights and designators. For readers tracking booster reuse, B1097's 13th flight and the landing totals for Of Course I Still Love You contribute to the ongoing operational statistics for SpaceX's West Coast launch cadence.