The thing is the Cold War ended 30 years ago. Yet we still maintain (and pay for) a Cold War posture in Europe. Our bases are in the worst strategic places in Europe. In Southern Germany. We cannot ship armoured vehicles south (they won't fit through rail tunnels and driving from Germany to get to Mediterranean ports is just stupid. We have to railhead vehicles to Northern European ports and then take the long way around Spain and Portugal to get to the Africa or the Mid-East. And if we are protecting Europe from Russia, then the Russians will have a running start through the Baltic States and Poland before US forces can engage them.
Poland has offered to build the infrastructure for US bases in Poland. We should take them up on their offer, if our intent is to protect Europe from Russia. However, institutional inertia keeps us tied to Baumholder, Grafenwoehr and Hohenfels.
And do we really need to have ~30,000 troops in NATO? We have eight Brigades* and a metric buttload of Headquarter type units. There needs to a be a complete re-think of NATO, because like Trump said, if Germany (and most of the rest of Europe, sans Poland) buys their Natural Gas from Russia, then Russia owns them, as they demonstrated back when Russia was getting frisky in Ukraine and Crimea a few winters back. Russia throttled back Natural Gas deliveries to Germany and as German households got colder, German objections to Russia's moves grew quieter.
*- Of the 8 "Brigades", only two are real "trigger pullers". A (Stryker) Cavalry Brigade and an Airborne Infantry Brigade (in Italy) . The others are Air Defense, Aviation, an MP Brigade (A battalion of MPs and a battalion of Combat Engineers), a Signal Brigade, an Intelligence Brigade, and a Combat Sustainment Brigade. Even even those are "light" in that they are smaller compared to a similar brigade in Cold War. For example, in the Cold War the 2nd Cav had 3 Squadrons of 5 Troops each. The new one has 3 Squadrons of 3 (smaller) Troops each, plus no Aviation Squadron. And it had M1s and Bradleys. Now it has Strykers. So it can't go into a stand-up, toe-to-toe fight with any armoured unit. In fact, there was a great deal of acrimony back in 2014-5ish when the 2nd Cav got their asses handed to them by every Balkan NATO ally that was using old Soviet era tanks during a huge NATO exercise at Hohenfels. "Embarrassing" was the word I heard used repeatedly to describe what happened, over and over, by each Country we went up against. We are pretty much back to the "hollow Army" of the 1970's.