The Space Development Agency announced contracts worth $1.75 billion to build 36 satellites in support of the Pentagon’s Golden Dome missile defense shield.

The satellites will be part of Tranche 3 of SDA’s missile defense, warning, and tracking layer, a constellation of satellites in low-Earth orbit. L3Harris and Sierra Space both received contracts to build 18 satellites each and deliver them in time for a potential launch in late 2028.
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The Space Force awarded initial contracts for Tranche 3 last December to Lockheed Martin, Rocket Lab, Northrop Grumman, and L3Harris for a total of 72 satellites. This additional batch of 32—which SDA calls Accelerated Missile Defense Tranche 3, or AMDT3—brings the total tranche to 104 spacecraft.
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SDA said in its statement that L3Harris’ satellite design will be based off the Hypersonic Ballistic Tracking and Space Sensor. L3Harris and Northrop Grumman each built one HBTSS prototype for the Missile Defense Agency, both of which launched as part of the first batch of SDA missile defense satellites.
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Sierra Space’s satellites will be missile warning/missile tracking spacecraft. The company said in a statement that the satellites will be based on its “Horizon” spacecraft. The company is already on contract to build 18 satellites for Tranche 2 of SDA’s tracking layer.