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Space Force announced March 24.
The geosynchronous SBIRS GEO-5 is the fifth satellite of the Space Based Infrared System program. Lockheed Martin said the manufacturing of SBIRS GEO-5 was completed in December.
SBIRS satellites use staring and scanning infrared sensors to detect missile launches and provide advance warning.
The first satellite launched in 2011, the second in 2013, the third in 2017 and the fourth in 2018. The final satellite SBIRS GEO-6 will launch in 2022.
ULA said the Atlas 5 for this mission will be a 421 configuration — with a four-meter payload fairing, two strap-on solid boosters and a single engine upper stage.
Lockheed Martin said SBIRS GEO-5 is the first military satellite that uses a new bus developed by the company, the LM 2100. SBIRS GEO-6 also is being built on that bus.
The SBIRS constellation was designed to replace the Defense Support Program, a system of early warning satellites made by Northrop Grumman that has been in operation since the 1970s.
Both Lockheed Martin and Northrop Grumman are now under contract to develop new missile-warning satellites known as Next-Generation Overhead Persistent Infrared.