Germany deployed the second largest military contingent in Afghanistan, after the US. Since the Afghanistan jaunt was a response to 9-11, it seems to me that the Germans have been doing their fair share in supporting the US as a NATO ally. Of course you can't expect a real estate dealer to understand how these things work.
The thing I can't understand is why Trump awarded Poland a new military base. There were four countries (in addition to the United States) that spent at least 2% of their GDP on defense.
Greece – 2.38 percent
United Kingdom – 2.21 percent
Estonia – 2.16 percent
Poland – 2 percent
Poland wins the prize for being in fourth place? What's that all about? Seems like maybe Greece, the UK, and Estonia would say screw it, and reduce their level of defense spending to an even 2% as well. Obviously, there is no reason to spend more.