Yes, many G-Shocks are popular in the military sphere. The primary reasons are: extremely tough, reliable, and functional with a stealth design. There are also simpler versions, with 200m water resistance and backlight, but there are also professional liens: MUDMASTER ( mud resistant), FROGMAN (for proffesional divers), RANGEMAN (with compass/barometer, thermometer), GRAVITYMASTER (pilots), GULFMUASTER (sea & ocean), G-SQUAF (with sport functions).