STP-5 (SIRI-3 & PUMA)

Liftoff Time

No Earlier Than 2026

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Mission Details

SIRI-3

Strontium Iodide Radiation Instrument (SIRI)-3 will take knowledge gained from the previous missions to develop a large prototype instrument for europium-doped strontium iodide gamma ray detection technology.

Operator: U.S. Naval Research Laboratory

Low Earth Orbit

1 Payload

PUMA

The Propulsion Unit with Modular Applications (PUMA) is a demonstration of the Air Force Research Laboratory's modular spacecraft propulsion technology that enables dynamic space operations across the full space ecosystem. Modular propulsion technology eliminates integration constraints by establishing standard interfaces and model-based systems engineering for rapid space vehicle and launch vehicle integration, on-orbit refueling, and propulsion system upgrades.

Operator: Air Force Research Laboratory

Low Earth Orbit

1 Payload

Rocket

Active
Vulcan Centaur

Active Since 2026

United Launch Alliance logo

Agency

ULA

Rocket

Diameter: 5.4m

Fairing

Diameter: 5.4m

Stages

2

Launch Site

SLC-41

Cape Canaveral SFS, Florida, USA

Fastest Turnaround

15 days 22 hours