The most legit military watch is built for apocalyptic combat

In extreme combat situations, military planners consider the impact of a nuclear weapon detonation on electronics. The resulting EMP can knock out devices for miles, affecting laser designators and precision munitions. Commanders may have to rely on alternative methods, such as using runners, since radios and other electronic devices are no longer functional.

Troops may also have to switch to iron sights and compasses. A mechanical watch can still function in such scenarios, as seen in a hypothetical situation where a first sergeant's issued watch remains operational after an EMP. Further details on this scenario are available from the source.