Atlas V rocket launches the Space Force's Silent Barker 'watchdog' satellites in dazzling morning liftoff (video)

The United States Space Force is about to get an unprecedented view of some of the most distant reaches of Earth orbit to safeguard national interests after a stunning Sunday morning rocket launch from Florida.

After a series of delays, the United Launch Alliance (ULA) launched the new multi-payload Silent Barker mission, also designated as NROL-107, into orbit for the Space Force and the National Reconnaissance Office (NRO) Sunday morning (Sept. 10). It soared spaceward into the blue sky atop an Atlas V rocket that lifted off from Space Launch Complex 41 at Cape Canaveral Space Force Station at 8:47 a.m. EDT (1247 GMT).  

At the request of the Space Force and NRO, ULA representatives ended live coverage of the launch minutes after liftoff as the Atlas V rocket jettisoned its clamshell-like payload fairing, exposing the military satellites of the Silent Barker mission to space. 

Sunday's launch came after a series of delays for the Space Force mission. Plans to launch the flight on Aug. 29 were delayed by weather impacts from what was then Tropical Storm Idalia. A launch attempt on Sept. 9 was delayed by a technical issue.

Atlas V rocket rolled to pad for 'Silent Barker' spysat launch (photos)

An Atlas V rocket carrying the classified Silent Barker multi-payload satellite for the National Reconnaissance Office and Space Force lifts off from Cape Canaveral Space Force Station, Florida on Sept. 10, 2023. (Image credit: United Launch Alliance)

Silent Barker markd the 18th and penultimate Atlas V mission for the NRO to launch from Cape Canaveral; ULA will soon replace the rocket with its new Vulcan Centaur. The mission will place multiple highly secretive payloads into geosynchronous orbit, the region of space some 22,236 miles (35,786 km) up that allows spacecraft to remain stationary above fixed points on Earth

Space Force Lt. General Michael Guetlein, commander of Space Systems Command, said in a pre-launch teleconference on Aug. 28 that the Silent Barker mission is designed to "deter aggression" through letting the United States' potential adversaries know that the Space Force is keeping a close watch on what happens in geosynchronous orbit (GEO).

"A huge element of deterrence is the ability for the adversary to know what we can and cannot see," Guetlein said. "So we actually want our competitors to know that we have eyes in GEO and that we can see what's happening in GEO. Not only are we going to maintain custody and the ability to detect what's going on in GEO, but we'll have the indications and warnings to know there's something out of the normal occurring, and that goes a long way towards deterrence."

The Atlas V rocket carrying the Space Force's Silent Barker classified satellites streaks across a dazzling, blue morning sky above Florida during its Sept. 10, 2023 launch. (Image credit: United Launch Alliance)

Silent Barker will act as a "watchdog" in geosynchronous orbit, keeping an eye on any satellites that reposition themselves to get a better look at U.S. spacecraft or even to carry out counterspace attacks, according to NRO director Chris Scolese.

"Satellites do move in geosynchronous orbit," Scolese said. "You've heard about communication satellites moving from one location to another to provide better coverage for other areas. Certainly we want to be able to see that so we know what is going on in that area. 

"But we also want to know if there is something going on that is unexpected, or shouldn't be going on that could potentially represent a threat to a high value asset, either ours or one of our allies'," Scolese added.

The exact capabilities of Silent Barker remain unknown. During Monday's teleconference, officials confirmed that Silent Barker will consist of multiple payloads, although neither the NRO nor Space Force are sharing exact numbers   — nor is either agency divulging the manufacturers and contractors with whom they are partnering to develop the Silent Barker spacecraft, Scolese said in response to a question from

However, in 2021, Air Force Space and Missile Systems issued a contract modification to defense contractor L3 Harris, noting that the total value of its Silent Barker contract was over $283 million. A previous budget estimate conducted by the Government Accountability Office estimated the cost of the program to be $994 million, with a planned full operational capability scheduled for 2026.

Silent Barker's data will be processed by the National Space Defense Center in Colorado Springs, while the satellite itself will be operated by the NRO.

Silent Barker's launch comes after the U.S. Space Force has established units dedicated to tracking threats in orbit and even targeting enemy satellites.

Editor's note: This story was updated at 9:36 a.m. ET on Sept. 10 to reflect the successful launch of the Silent Barker mission.

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Brett Tingley
Managing Editor,

Brett is curious about emerging aerospace technologies, alternative launch concepts, military space developments and uncrewed aircraft systems. Brett's work has appeared on Scientific American, The War Zone, Popular Science, the History Channel, Science Discovery and more. Brett has English degrees from Clemson University and the University of North Carolina at Charlotte. In his free time, Brett enjoys skywatching throughout the dark skies of the Appalachian mountains.