I don't understand how any of the quoted portion above has bearing on why our forces are needed in Europe. Are you trying to say that if Russia invades Europe we will need to do an amphibious assault, and we aren't capable? As in.. you think Russia will take their WW2 tanks and sweep across to Portugal before we can get anyone in theater? I'm confused.
So the US should keep troops in Europe to deter.. what countries? Egypt and Morocco? Syria? What evidence convinces you that that is a legitimate threat that US taxpayers need to be concerned about?
If they want the additional troops, great. If they don't, then the point still remains that downsizing in Europe does not greatly affect our readiness in Asia. In fact, it allows us to be more laser focused on China.
What claims would you like data for?
The first 2 sentences are possibly the most hypocritical I've ever read, but thank you for telling me what my experience is. I am not discussing tactics, but history and strategy, and I have ample experience in both. Not that it matters for anything other than your ad hominem fallacy.
As for history, I'm happy to give examples. You alluded to some good ones. Russia barely defeated invading armies, while fighting for their survival, during the Napoleonic Wars and WW2. The aggressors were not unified of course, and the wars were fought with roughly equal technology. To emphasize, they nearly were conquered by both France and Germany while those powers were fighting many other adversaries simultaneously.They also lost to invading armies in WW1 and the Russo-Japanese War. Defense is easier than offense in war.
They are currently doing their best to invade Ukraine, and with some older weapons given to Ukraine with hasty training, the Russians are stalled and back on the defence. What do you imagine would happen if all of Europe declared war on Russia tomorrow? Unless the answer is "Russia would not cede any ground", when Russia would be defending, then why do you think Russia would be able to have any success with attacking? Even more so if Europe is defending their homes and the Russian conscripts are only their because they got a get out of jail free card. Do you remember how they ran out of gas and supplies just trying to get to Kyiv? If you don't think Europe would establish air superiority, bomb the Russia encampments into oblivion, and then break the Russian lines, then we will have to agree to disagree.