SpaceX launched a secret rapid response mission for the Space Force on Monday evening, flying a GPS III satellite aboard a Falcon 9 rocket.

Dubbed the Rapid Response Trailblazer, the initiative was intended to demonstrate the ability to quickly plan and launch a mission in about six months – a process that typically takes about two years.

“The mission successfully demonstrated a complex integration effort across multiple Space Force organizations to retrieve an existing GPS III satellite from storage, accelerate integration and carrier readiness, and rapidly advance the launch process,” the Space Force said in a statement.

The launch took off from Cape Canaveral Space Force Station in Florida at about 7:52 p.m., and the first stage booster landed on a drone ship after releasing the GPS payload.

The Space Force has demonstrated the ability to quickly launch small payloads on commercial rockets through its Tactically Responsive Space program, but this mission was the first to use a large National Security Space Launch-class payload.

For Rapid Response Trailblazer, Space Force buyers at Space Systems Command worked closely with Space Operations Command operators to prepare and integrate the payload for launch. Walt Lauderdale, mission manager for Monday’s launch, said alignment was key to the mission’s success.

“This partnership is an example of new and faster ways we can conduct launches to meet future fighter aircraft needs,” Lauderdale said in a statement. “The Space Force quickly activated multiple organizations, and the joint team delivered a specific, important mission to orbit in record time.”

The launched GPS III satellite was built by Lockheed Martin and sat in storage awaiting a flight on United Launch Alliance’s Vulcan rocket, which has experienced delays and is not yet certified to fly national security missions. Space News reported that the decision to redirect the satellite to a SpaceX Falcon came earlier this year.