Efficiency should be balanced with other concerns. The US defense sector requires domestic manufacturing for good reason. The US recently got bitten hard with

Efficiency should be balanced with other concerns. The US defense sector requires domestic manufacturing for good reason. The US recently got bitten hard with an inability to manufacture 5G equipment. The loss of skills accompanying loss of industry is a huge problem that can take decades to fix. There is a reason pilots prefer flying two engine aircraft, even though you really only need one engine. Redundancy is important.