A Search & Rescue helicopter can produce sustained oscillating acceleration layered on top of G forces. For the crew, it feels like riding a washboard gravel road at 120 mph, for the entire flight. That’s just one environment the Marathon JSAR is engineered to endure over a lifetime on the wrist. 316L steel for unmatched durability. Screw-down crown to resist vibration. High-torque Swiss quartz that keeps exact time mission after mission. That’s #milspec. #purposebuilt #milspec