Two ideas; One, never fight a land war in Asia. Similarly, never fight a land war in America. Second, the American military is infamously bad at asymmetrical warfare and vulnerable to sabotage.

Couple that with an entire administration that has decided to make loyalty to the Führer the most important job qualification, and a shit ton of pissed off competent vets who still know how to fly a fighter jet or drive a tank, it would probably be more evenly matched than most Americans think.