One field in which metric units have made a significant advance in the US is the military. As the years go by, the US Military has increasingly had to work literally "in the trenches" next to soldiers of many nations. The use of the metric system is essential to ensure clear and accurate communication with military partners throughout the world, who wouldn't know a mile from a hole in the ground! Today, joint operations and training, such as for NATO, make the use of the metric system by all parties an obvious necessity.
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