Norway and US are allies that’s how Norway is comfortable to host most of its government data on AWS for instance, or to use US made products everywhere. But for obvious reasons there is always a limit when it comes to sensitive data.
I’m sure they do all sorts of intelligent cooperation and data sharing on demand. But we are talking about military and this is not on demand data sharing.
Do you expect US military to accept sharing the same type of data back to its allies for the same reasons? Norway’s military is simply asking for a way to filter these data.
There are data that they never want to share (e.g. secret missions), and there are sensitive data that they want to always filter.