The Defense Department announced Tuesday that it would eliminate the selective availability feature on new Global Positioning System satellites. That decision coincides with the view expressed earlier this year by the National Space-based Positioning, Navigation, and Timing Advisory Board. The Pentagon stopped using the SA feature, which permitted satellite operators to intentionally degrade the GPS signal, in May 2000, but the advisory group believes that the continued inclusion of the SA feature generated international mistrust at a time when alternatives to GPS are emerging.
A U.S. Air Force F-22 shot down a Chinese surveillance balloon off the coast of South Carolina on Feb. 4, a week after it first entered U.S. airspace near Alaska. Officials said they took measures to prevent the balloon from gathering sensitive military information and are actively working to recover…