But yes, if the US gave a 100%, it may have a chance of actually winning those wars. Considering the collateral damage from decades of "surgical" strikes and drone attacks, I'm not even sure an all-out war would be any worse for the civilians on the receiving end.
It would absolutely ruin any pretence of moral superiority and "clean" warfare, however. And that would make it even more difficult to explain to allies why the US is better than Russia, China or Saudi Arabia.