Engineering, design and drawings are mostly done in the U.S. if the company is a U.S. based outfit. All military contractors and companies making what could be dual use items (military or commercial) do all the engineering and manufacturing in the U.S.
No U.S. company wants China to get their grubby mits on the intellectual property that easily.
That is not what happened at the outfit I worked for. Our outfit did almost Billion dollars sales and had 200 workers in engineering department. China bought our engineering know-how developed over 60 years for about $10 million. The owner thought it was lot of money for just giving them paper drawings, and other engineering handbooks. This transaction happened in early 1980”s.