The fighting methods of the US military just can't work for fighters like those of Ukraine because only the US military (and the modern Chinese military) are capable of such front-line logistics and combined arms coordination.

The US military is perfect for the type of fighting happening in Ukraine, where the US military fails consistently is when it has to then occupy an entire nation after it has steam rolled over any conventional army in it's path. The US has proven multiple times since WW2 that it is still capable of such fighting, that it excels at it. It is the occupation and counter insurgency stage that the US military fails at, although it doesn't even fail at that because maintaining a conflict at low intensity is a US goal after the conventional military fighting is over. This is why the US after it stomps a nations conventional military into the ground only ends the counter insurgency stage of the conflict after it has lined up a new cash cow. Afghanistan ended when the US finally had the situation in Ukraine primed.