US Marines based in Okinawa, Japan train with drones. Cpl. Joaquin Dela Torre/US Marine Corps Even top Marine units are struggling to operate under drone threat in training The Corps is racing to catch up as counter-drone solutions lag behind for the entire military Some Marines are turning to fiber-optic drones to cope with federal regulations limiting training Hostile drones are challenging even highly trained US forces, which have struggled to contend with constant surveillance and attac...