Military watches are dependable watches. Many come with end-of-battery-life warnings, so you know your watch won't suddenly fail you when you might need your watch the most. Have you ever had a watch break easily? The military knows how rough life can be on a watch, and many military watches have additional features to protect the watch and to enhance the durability of the watch, like unidirectional ratcheting bezels, crown protectors, scratch-resistant crystals, screw down case backs, and safety clasps on the bracelets and bands of the watch.
Even a single second can be crucially important in aviation; a pilot has no room for error when it comes to time, and that's why pilots use the best of aviation watches. In today's fast-paced world, watches of extreme accuracy and quality are needed in many fields. Pilot watches and aviation watches often come loaded with gizmos like tachymeters, unit conversion slide rules, chronographs (some with hands measuring down to a tenth of a second!), and other features critical to pilot watches, like anti-reflective crystals and non-radioactive luminescence.