SpaceNews:

Lockheed Martin announced, on Dec. 2, that it has completed production of the fifth satellite of the Space Based Infrared System constellation. The geosynchronous satellite, known as SBIRS GEO-5, is projected to launch in 2021 on a United Launch Alliance Atlas 5 rocket.

Four geosynchronous SBIRS satellites are on orbit today. The billion-dollar spacecraft are equipped with powerful scanning and staring infrared surveillance sensors that can detect missile launches anywhere in the world.

SBIRS GEO-1 launched on May 7, 2011; GEO-2 on March 19, 2013; GEO-3 on Jan. 20, 2017, and GEO-4 on Jan. 19, 2018…

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