When someone else bankrolls your defense by spending almost a trillion dollars a year that leaves quite a lot of the budget for other things, doesn't it?
However, since this post is about US GDP I'm now curious, what do you think where this money is going and contributing to GDP?
That is the whole defense budget from the US, not how much it spends in Europe.
And yes, EU should stop relying in the US for defense. That arrangement only benefits the US, to be frank, EU should develop its own defense industry instead of strengthening the defense industry of a foreign nation. Especially now that said foreign nation is essentially enemy territory.