The Pentagon wants ultra-precise clocks that could help troops fight without GPS

A soldier plots points for land navigation at Schofield Barracks East Range, Hawaii on June 2, 2021.Sgt. Ezra Camarena/US ArmyGPS depends on precise timing, but its weak satellite signals can be jammed or spoofed.DARPA has tested resilient, ultra-advanced compact clocks that could help troops fight without GPS.DARPA says the technology could enable entirely new military capabilities.The Pentagon's research arm has been experimenting with a new generation of ultra-precise clocks, with the hope of