‘Foreign Aid’ encompasses a number of programs, many of which are useless and could easily disappear. There are a few, however, such as foreign military financing (FMF), that have benefits few see.
Just because we may sell a weapon system to a foreign nation doesn’t mean it comes with the same internal components as our system with the same name.
The Soviets called those ‘monkey models. The equipment they sold was no the same as the equipment they used.