It doesn't really matter how effective it is in combat. The project is a wealth transfer first, and a "job creator" second. The only foreign purchases will be either from countries that the US bullied into making some orders, or countries that receive "aid money" from the US, much of which is disbursed in the form of de facto gift cards for the military contractors who are too big to fail, and too friendly with well-connected people in the public sector.

Edit: See grecy's comment for a perfect example. They're a vehicle to siphon taxpayer dollars, not a vehicle to fight wars.