Louisville-based Sierra Space just scored one of Colorado’s biggest recent space wins, locking in a roughly $798 million Pentagon contract to build 18 missile-warning and tracking satellites for the Golden Dome program. The deal puts Sierra Space in the driver’s seat as a prime contractor on the Space Development Agency’s accelerated AMDT3 tracking layer, with the hardware slated to roll off the company’s high-rate production line in the Denver suburbs. It is the latest move in the Pentagon’s sprint toward smaller, cheaper low Earth orbit satellites designed to sharpen missile warning and tracking.
On July 13, the Space Development Agency said it had issued two prototype agreements worth about $1.75 billion to add 36 AMDT3 tracking satellites. Sierra Space will supply 18 of those spacecraft under an agreement valued at up to $798 million, while L3Harris landed the companion award. According to the agency, the AMDT3 satellites are meant to widen missile warning, tracking, and defense coverage and will plug into SDA’s existing Tranche 1 and Tranche 2 constellations.
Sierra Space plans to base the AMDT3 satellites on its Horizon spacecraft bus and build them on the company’s Victory Works production line. In a press release carried by PR Newswire, CEO Dan Jablonsky called the award “a demonstration of Sierra Space’s capabilities as a formidable player in American national security.”
The work will run through Victory Works, the high-rate manufacturing line Sierra Space opened to handle defense satellite programs across the Denver metro area. The Denver Business Journal detailed the Victory Works expansion last year, and industry coverage notes Sierra Space previously locked in a Tranche 2 tracking contract in January 2024 worth roughly $740 million. Breaking Defense and other outlets report Sierra Space hit early production milestones on that earlier work ahead of schedule, a track record that likely did not hurt in this latest competition.
How This Fits Into Golden Dome
The AMDT3 awards build on a steady drumbeat of Tracking Layer buys that are filling in the Pentagon’s overarching Golden Dome missile-defense architecture. Last December, SDA handed out more than $3.5 billion for 72 Tranche 3 tracking satellites split among Lockheed Martin, L3Harris, Northrop Grumman, and Rocket Lab, a cluster of awards that analysts say is reshaping the defense-satellite landscape. Satellite Today reported that the new AMDT3 contracts are expected to have satellites ready for launch by the end of 2028.
The Space Development Agency says AMDT3 will field spacecraft across multiple orbital planes, with the U.S. Space Force taking over operations and long-term sustainment. The agency describes the deals as firm-fixed-price Other Transaction Authority prototype agreements, structured to speed production and delivery rather than let them languish in development limbo. The Space Development Agency also emphasized that AMDT3 spacecraft will be interoperable with existing Tracking Layer satellites already in orbit or in the pipeline.
What It Means for Colorado
For Colorado’s booming space sector, the Sierra Space win is another big notch on the belt. The state already hosts major military satellite production, including Lockheed Martin’s sprawling Waterton Canyon / Littleton campus, which has poured money into new small-satellite processing capabilities. Lockheed Martin and local coverage highlight how the company’s Gateway Center supports high-rate satellite manufacturing that now sits alongside Sierra Space’s growing defense backlog.
Analysts and local observers say this avalanche of contracts is likely to draw more suppliers, engineers, and technicians into Colorado’s aerospace ecosystem, right as Congress leans on the Pentagon to speed up missile-tracking deployments. Air & Space Forces has reported that lawmakers are pressing for faster fielding of HBTSS-like tracking satellites, keeping pressure on SDA and its contractors to deliver.
Next on Sierra Space’s checklist is moving from building structures to full assembly, integration, and testing at Victory Works, followed by qualification and handoff into SDA’s common ground system. Industry analysts say the next 18 to 30 months will be make-or-break as the Pentagon races to get more persistent, resilient low Earth orbit missile warning and tracking into service, with Colorado manufacturers playing a central role. Satellite Today noted the aggressive schedule that all of these players will now have to hit.
