L3Harris Technologies and Sierra Space have won a contract to manufacture 36 satellites for the Space Force's next-generation missile warning constellation. The partnership expands the U.S. military's overhead persistent infrared detection system beyond the current Space Based Infrared System infrastructure.
The new satellites will provide continuous global coverage to detect and track ballistic and cruise missile launches. This capability underpins strategic deterrence and rapid response operations across American defense posture. L3Harris will lead production at its manufacturing facilities while Sierra Space contributes spacecraft systems expertise.
The 36-satellite constellation represents a significant scaling of the existing SBIRS architecture, which operates fewer satellites in geostationary and highly elliptical orbits. Adding more orbital assets reduces detection gaps and improves coverage over critical regions. The expanded network will enhance warning timelines for decision-makers and improve battlespace awareness.
Production timelines remain aligned with Space Force acquisition schedules, though specific deployment dates were not disclosed. The contract reflects broader Pentagon strategy to modernize space-based surveillance capabilities against advancing global threats. Recent geopolitical tensions have accelerated investment in overhead infrared constellation resilience and redundancy.
Both contractors bring complementary strengths to the effort. L3Harris manufactures infrared sensors and spacecraft components for military space systems. Sierra Space, formerly Sierra Microgravity, specializes in small-to-medium class satellite buses and orbital service vehicles. This pairing allows rapid production scaling without sacrificing quality or technical sophistication.
The missile warning constellation program underscores how space infrastructure now functions as backbone for national security operations. Detection systems orbiting thousands of miles overhead translate to seconds of warning time for continental defense. As adversaries develop faster missiles and more complex threat profiles, maintaining space-based surveillance dominance becomes operationally critical.
The Space Force continues investing heavily in architectures that distribute sensors across multiple orbital regimes and spacecraft designs.