Sierra Space’s Resilient GPS (R-GPS) satellite program reached a key milestone with the successful completion of Systems Requirements Review, the company announced on January 16, 2025.

Called R-GPS for short, the program is intended to provide an alternative, backup network for the current satellite system.

According to the subcommittee, the department has since notified Congress it expects the Resilient GPS program to cost $1 billion over the next five years. To date, the Space Force has repurposed $40 ...