The U.S. military is fundamentally changing how it watches the skies, moving its eyes from the atmosphere into orbit.
For decades, the U.S. has relied on large, crewed aircraft like AWACS and JSTARS to detect airborne threats. However, these planes are becoming increasingly vulnerable. Advanced air defense systems from nations like China and Russia can now target them from hundreds of miles away, creating "no-go" zones. This growing risk means the U.S. can no longer guarantee air superiority with its old methods.
To solve this, the Space Force is building a new surveillance layer in Low Earth Orbit (LEO). On May 29, 2026, it awarded SpaceX a massive $4.16 billion contract to build the first part of this system, called the Space-Based Airborne Moving Target Indicator, or SB-AMTI. This will be a constellation of satellites designed to persistently track aircraft, drones, and cruise missiles from space, with the first satellites expected to be operational by 2028.
This decision didn't happen overnight. First, the need was driven by escalating global threats, such as Russia's use of hypersonic missiles in Ukraine and China's military expansion in the South China Sea. These events proved that a faster, more resilient surveillance system was critical. Second, earlier technology demonstration missions, like the SDA's Tranche-0 satellites, proved that a network of small satellites in LEO could effectively track targets and communicate.
Crucially, the SB-AMTI award is just one piece of the puzzle. Just three days earlier, the Space Force gave SpaceX another $2.29 billion contract to build the "Space Data Network" (SDN). Think of the SDN as the high-speed internet backbone in space. It will use optical laser links to instantly transmit the tracking data from the SB-AMTI sensor satellites to military units on the ground, in the air, or at sea.
Together, these two contracts, totaling over $6.4 billion in a single week, represent a landmark shift. The Pentagon is moving beyond experiments and is now actively building a large-scale, integrated "sensor-to-shooter" network in space. This new architecture aims to make U.S. defense faster, more resilient, and globally persistent.
- Low Earth Orbit (LEO): An orbit relatively close to Earth's surface, typically below 2,000 km. It allows for lower latency communication and higher-resolution imagery compared to higher orbits.
- AWACS (Airborne Warning and Control System): A type of aircraft equipped with powerful radar to track other aircraft, serving as a command and control center in the sky.
- Sensor-to-Shooter: A military concept where data from a sensor (like a satellite or drone) is transmitted directly and quickly to a weapon system ("shooter") to engage a target, shortening the response time.