Most, if not all, have had some training in physics, or other physical sciences, which are metric. If someone ventures onto a NASA website, and doesn't understand metric, they won't understand any of the other technical terms either. To provide you with data in English units, means they already are taking money from a shrinking budget. Then from your statement, they should only be using metric units, as taking money from projects to convert metric to English is unacceptable. For NASA to purchase hardware in the USA, they MUST specify English units.
Shop tries to makes part.
Shop orders metric tooling. Shop finally makes part. OH Boy are you way off. All automobiles are designed and produced in metric. And autos use a lot of parts.