I can’t speak for the U.S. military, but Google accounted for GPS satellite failure (in response to the actions of a hostile power, solar weather event, or any

I can’t speak for the U.S. military, but Google accounted for GPS satellite failure (in response to the actions of a hostile power, solar weather event, or any other reason) in their design of Spanner, which relies on precise time synchronization between geographically-distant data centers. In the Spanner white paper, the atomic clocks used in case of GPS satellite failure are called “Armageddon masters”: http://static.googleusercontent.com/media/research.google.com/en//archive/spanner-osdi2012.pdf http://static.googleusercontent.com/media/research.google.co...