I think there are a lot of different reasons. There are many aspects of our procurement system that are different.
I think it's difficult to look for examples where we are buying literally the same thing. The F-35 is actually one example where we are, but in a lot of cases even small differences in terms of the specific features you want in a vehicle, aircraft or ship can make it quite different in terms of how you actually go about buying it.
Making those types of international comparisons is pretty tricky without doing a real apples-to-apples comparison.