We do control the GPS network, but short of turning it off over Israel, which might cause more difficulty for the Israeli's than it would help, I'm not sure how much control that gives us.
GPS is a one way communication. The satellites broadcast information which the GPS receiver uses to determine location.
The broadcast could be turned off, or made less accurate, but we can't selectively disable some weapons using it.
The weapons themselves could be programmed to not work in Israel, but that might be reverse engineered given time.
I don't think we could reliably prevent these weapons from being used against Israel, or even against us if they fell into the wrong hands.
Very true, but when faced with the possibility they are going to get their equipment from China, N. Korea, Russia, or us, which would we have the best chance of controlling through things like SOSCOE, or as has been mentioned, tracking it through GPS. This also makes the Saudis dependent on us, and thus, our best interest is more vital to their infrastructure. If they acquired this equipment from China, for example, then they would be looking out for China's best interest and we would not have any chance of a SOSCOE type control over the equipment...
There is always more to the story than the first knee jerk reactions a lot of people have.. kind of like Dubai Ports.. we lost an opportunity to have our agents in ports all around the world and all of DPI's ports upgraded with US security measures..