Since the first model birth of 1983, G-SHOCK continued insatiate evolution. It is born by a challenge to common sense, "the watch is vulnerable to a shock". I realized a firm watch as it was not broken even if I dropped it by shock absorbents made by internal mechanism independent of an integumentary covering, polyurethane from two or three floors. Thereafter, in the both sides of a function and the design, I caused various innovation in the clock market. It is used habitually and is got close to pilot of the fighter, police Special Forces SWAT by a pet name of combat Casio from United States Armed Forces soldiers now including United States Armed Forces Special Forces.