https://techcrunch.com/2020/06/30/watch-spacex-launch-a-gps-iii-satellite-for-the-u-s-space-force-live/

SpaceX is set to launch a Falcon 9 rocket today from Cape Canaveral Air Force Station in Florida. The launch is set to take place at 3:55 PM EDT (12:55 PM PDT), with a 15-minute window opening at that time, and there is a backup opportunity on Wednesday, July 1 if the launch needs to be pushed back for any time. This rocket is carrying a GPS III Space Vehicle, which is named “Katherine Johnson” after the NASA mathematician who played a fundamental role in Mercury, Apollo and Space Shuttle programs.

The launch today will add another GPS III satellite to the U.S. Space Force’s existing in-space GPS assets, which include three already on orbit, with another one set to be deployed in 2022. This third-generation GPS satellite is three times more accurate, and eight times more resilient in terms of its ability to resist gaming efforts than prior versions. In addition to its use for military and defense applications, the GPS III satellite will also contribute to civilian GPS-based satellite navigation.