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SBIRS GEO Flight-4 is the latest satellite to join the Air Force's orbiting missile warning constellation equipped with powerful scanning and staring infrared surveillance sensors. The sensors collect data for use by the U.S. military to detect missile launches, support ballistic missile defense, expand technical intelligence gathering and bolster situational awareness on the battlefield. The satellite also completes the initial constellation and allows SBIRS to provide global coverage.
The satellite will join SBIRS GEO Flights 1, 2 and 3, which were launched in 2011, 2013 and 2017 respectively
Seems like we are being prepared for a missile alarm related event - but why? What is the point?