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On September 10, the Space Development Agency (SDA) achieved a significant milestone with the successful launch of 21 tactical data communications satellites aboard a SpaceX Falcon 9 rocket from Vandenberg Space Force Base in California. This inaugural mission is the first of an anticipated ten launches designed to deploy the full tranche 1 segment of a new proliferated satellite constellation aimed at enhancing military communications capabilities.

Lifting off at 10:12 AM EDT, the Falcon 9's first stage booster successfully returned to the Pacific Ocean, landing on the drone ship "Of Course I Still Love You" less than nine minutes after liftoff. The satellites, constructed by York Space Systems, are integral to the SDA’s Transport Layer, which forms part of the Proliferated Warfighter Space Architecture (PWSA).

Once operational, this mesh network will offer beyond-line-of-sight connectivity for operators employing Link 16 radios, with the U.S. Indo-Pacific Command identified as the first user.

SDA acting director Gurpartap “GP” Sandhoo emphasized the significance of this launch, noting that the transport layer will provide secure data relay for battlefield communications and improved coverage as additional satellites are deployed. The initial capability is expected to come online by 2027, enabling enhanced tactical military data channels, including advanced missile tracking and beyond-line-of-sight targeting.

The complete tranche 1 constellation is set to comprise 154 operational satellites, with 126 to be launched over six missions for the transport layer, supplemented by 28 missile warning and tracking satellites launched over four missions. York Space Systems, Lockheed Martin, and Northrop Grumman are tasked with building 42 satellites each for the transport layer, while L3Harris Technologies and Northrop Grumman are responsible for missile warning and tracking satellites.

Operational management of this constellation will be centralized at two SDA space operations centers located at Grand Forks Air Force Base in North Dakota and Redstone Arsenal in Alabama, complemented by a global network of ground entry points.

As the SDA prepares for its next launch, expected in mid-October to deploy the first plane of Lockheed Martin-built tranche 1 satellites, the agency is already moving forward with the development of the next batch of tranche 2 satellites, slated for launch in 2027. Once both tranches are fully operational, the SDA anticipates achieving global coverage for tactical data relay and missile warning missions.

In parallel, the SDA launched 27 satellites as part of its demonstration tranche 0 initiative in 2023 and 2024, which included 19 transport layer satellites and eight tracking layer spacecraft. As the PWSA takes shape, the agency plans to continue utilizing these tranche 0 satellites for technology testing throughout their operational lifespans, affirming the commitment to advancing military communication capabilities in an increasingly complex operational environment.