This image shows the test firing of ExoTerra Resources' xenon fueled microsatellite thruster.  Credit: ExoTerra Resources
SBIRS in test stand
The 45th Space Wing supports United Launch Alliance’s successful launch of the third Space Based Infrared Systems Geosynchronous Earth Orbit spacecraft aboard an Atlas V rocket from Launch Complex 41 Jan. 20, 2017, at Cape Canaveral Air Force Station, Fla. The launch is the first major launch operation of 2017 on the Eastern Range and kicks off what is predicted to be a busy year. (Courtesy photo/United Launch Alliance)
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A U.S. Air Force Atlas 5 rocket lifted off Jan. 19 carrying the SBIRS GEO Flight 4 satellite.  Credit: ULA
Airmen at the Global Strategic Warning and Space Surveillance System Center at Cheyenne Mountain, Colorado, monitor strategic missile warning systems. (Air Force photo)
SBIRS GEO Flight 3 launched from Cape Canaveral Air Force Station, Florida, on Jan. 20 (Lockheed Martin photo)
The U.S. Air Force's  upcoming fifth and sixth satellites in its missile warning constellation will have a new satellite bus, Lockheed Martin's A2100. Credit: Lockheed Martin.

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