SBIRS GEO-5

The Space-Based Infrared System (SBIRS) is a consolidated system intended to meet the United States' infrared space surveillance needs through the first two to three decades of the 21st century. The SBIRS program is designed to provide key capabilities in the areas of missile warning, missile defense and battlespace characterization via satellites in geosynchronous earth orbit (GEO), sensors hosted on satellites in highly elliptical orbit (HEO), and ground-based data processing and control. SBIRS ground software integrates infrared sensor programs of the U.S. Air Force (USAF) with new IR sensors.

TDO (Technology Demonstrator Orbiter) 3 & 4 (also known as EZ 3 & 4) are experimental 12U cubesats flown for the United States Air Force Academy.