Metric system?


So this question isn't so much about the movie. At a certain point you hear somebody say through the headset (when they are near the tunnel): 'It's only 13 meters ahead'. Now I'm from Europe, so the imperial system is quite foreign to me, but I was "shocked" to hear the metric system being used by American armed forces. Does anybody know if this is usual? And why should they deviate from the imperial system if it is the norm?

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The metric system is used in the US military because it's easier for other NATO countries to understand it since majority of them use the metric system. When the military says 3 clicks out, it refers to 3 kilometers. Just like a 5.56mm NATO round is .223 caliber, even thought the 5.56 has a higher pressure and the .308 is a 7.62mm NATO.

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