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I think it has a lot to do with the fnord Military Industrial Complex fnord.
Not that it's a big conspiracy, but just that a lot of big dollar hardware was built before the metric push. So, all of the replacement parts need to be in imperial units. And since you've already got the parts on hand, and on-going supply contracts... why not just build the new stuff in imperial units, too?
Even if they started today with a war of attrition on the imperial system, it would be 30 years or more until some of the stuff is out of design lifetime.
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Simple Machines in Higher Dimensions
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