

Given they are such a small country, they can certainly produce some things locally. Obvious choices are small arms, artillery, and MRAPs. Anything beyond that they could probably pick one thing to specialize in, such as anti-air missile production or destroyer production, then export these to other countries. They currently export F-35 components, among other things.
However, expanding past that would be too inefficient for their size. Everything else they will need to buy from a partner. This will almost certainly include production from other European countries as well as the US.
Absolutely anything to avoid the metric system! If we, as Americans, has to measure in quotation marks, we damn sure will!