Tough Watches, Battle for the Most Rugged Watches in the World

Tough watches are reserved for those who love and need toughness more than anything else. There are watches that are designed to withstand extreme shock and vibration but yet highly sensitive to chemical exposure such as insect repellent or even sweat. There may not be a universal metric as to what defines a watch as being tough. But I see suitability of a watch to be used by the military as probably the best testament to this quality.