Journalism today:
No reasons given for moving, versus staying.
After WW II, the reason was to pacify, then "denazify" just defeated enemy Germany.
Moving into Cold War times, our troops were the trigger line against Eastern Germany which was the USSR's proxy.
Since the fall of the Berlin Wall, it has been forward positioning for adventures in places like the Balkans, the Mid-east etc.
Another purpose is to jointly train with our allies.
Germany also hosts the largest military medical facility outside the US.
Germany's Fulda Gap had been a warfare road for all time. (across Germany, to Poland and Russia).
I Romney has studied the matter deeply, he likely agrees with the Left, and we should immediately surrender, should hostilities break out anywhere within reach of our forces in Germany..