Lawmakers say the Space Force's plan to use proliferation to boost GPS resiliency may be flawed.

Pentagon leaders believe that estimate is conservative, leading the U.S. Space Force to kick off a new roughly $2 billion satellite program to build a backup GPS.

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 ...