@Vikarion
I think I will have to disagree with your US military equipment and training being 'superior' to the other combatants for WW2.
I've always understood it that Pound for Pound the Wermacht were by far better trained, better equipped, and better tactically than everyone else. Their defeat was because of ridiculous political and strategic objectives handed down and demanded by a lunatic - the field commanders and tacticians along with the equipment and manpower and training, were very, very far ahead of all competitors.
That's actually just a very well popularized myth, not least by the German fighting men who survived and (justifiably, perhaps) did not want to be seen as simply losers. And, in fairness, German training was generally good, especially in the early years of the war, if not as good as that of, say, U.S. Marines, or, probably, British Tommy's, who, man for man, often outfought the Wermacht.
Tactically, perhaps, the Germans had more opportunities to demonstrate brilliance than the Allies for most of the war, as the allies were on the offensive, and often constrained by terrain and strategic aims to fighting at certain geographic points. The Germans certainly displayed precious little tactical and strategic "brilliance" when on the strategic offensive after 1941. That said, in terms of actual tactical innovation, it was the Soviets who pioneered the tank-killing aircraft, and Americans who truly brought combined arms together. I can discuss this extensively if you like, but it might be easily framed as such: what tactical innovations did the Germans display that the Allies did not?
As for equipment, for example, it is true that, in a 1v1 tank battle in a flat field, at long distance, it was generally better to be in a Tiger or Panther than a Sherman. Unfortunately, "the better weapon" is not, and has never been, solely determined by the best armor or the most devastating firepower. The "best weapon" is the one that accomplishes your objectives to the greatest degree, including logistical ones. And yet, Germany produced only about 1,400 Tigers, while the Allies produced almost 50,000 Shermans. And the loss rate was far less than 10-1 or even 5-1. For example, in Hitler's last armored thrust of the Battle of the Bulge, the Germans lost 180 Panthers out of 415, with about 55% of the remaining Panthers out of action due to battle damage or mechanical problems. The U.S. First Army (which did most of the fighting) lost 320 Shermans, which left them with, well, 980 operational Shermans.
Why was the Sherman better?
When it was produced, it outclassed the Panzer IV in almost every way, aside from (perhaps) optics, with better armor, a better 75mm gun, and simple but rugged construction that made it one of the most reliable machines of the war. Unlike the Tiger and Panther, it was well designed mechanically, with generally easy to service parts and a long road life, including such innovations as rubber tracking on its treads. Its only major downside in regards to mechanical excellence was its narrower treads, resulting in a higher ground pressure. Contrast this with the high breakdown rate of German tanks, especially the Tiger 1, the King Tiger, and the Panther, whose drive train (transmission, etc) might last you 150km. If you were lucky. It also had the nasty habit of breaking if you accelerated or decelerated rapidly. And if you just sat there, a design flaw would sometimes flood the engine compartment with gasoline fumes, with predictable results. To put it in historical terms, at the Battle of Kursk, 184 Panthers were deployed. 44 of them promptly suffered "mechanical failures". That's 25% casualties without the enemy having to fire a shot.
If you did fire a shot, the Tiger had a great gun. The Panther, for some reason, had been given a gun that tended to wear out quickly due to its design, while not being any better at killing tanks than the Tiger's 88mm, and being significantly worse (due to a small HE shell) at providing infantry support - which is a tank's primary occupation most of the time. As if that weren't enough, the Panther's side armor was bad, and almost all German tanks had slower turret rotations than the Sherman. And once Shermans were equipped with 76mm guns and HVAP shells, they could penetrate the frontal armor of anything but a King Tiger at almost any reasonable combat distance. This was helped by the addition to the Panther of a "shot trap", that is to say, the design of the Panther's turret tended to direct ricochets downward - right through the top of the tank deck and into the driver or ammunition storage.
And if you were hit, despite claims soon after the war, compiled statistics show that Shermans were no more likely to burn than other tanks - and once water jackets for ammunition were introduced, far less. German tanks, on the other hand, were among the most likely to brew up, if hit, not least because of a lack of internal ammunition protection throughout the entire war. Many "destroyed" Shermans were quickly repaired and sent back onto the battlefield.
The verdict of history might also give us a clue. In the Battle of Arracourt, one of the few true tank battles between American and German forces, the Wermacht attacked an outnumbered American armor command with Panthers and assault guns. Using fire and maneuver, the American force then proceeded to destroy 86 tanks and assault guns at the cost of 32 of their own, a ratio of more than 2:1 in favor of the U.S. forces. After the war, Shermans continued to be used with great success, such as in the Korean war, where the Sherman proved more than a match for the T-34-85, and by the Israelis, who up-gunned it and wiped out more modern Soviet armor.
This is not the only example of looking beyond popular myth. As well, consider that the standard German battle rifle was a bolt action weapon, which was never fully replaced, while, say, the American GI was issued the Garand. Or that the German MP40 had an inferior magazine feed compared to the Thomson (American) submachine gun, and fewer rounds than the Soviet PPsH, while also possessing less stopping power than either the Thompson or M3 American submachine guns. And the Germans couldn't make as many submachine guns as either the Americans or Soviets.
Again, this sounds a bit jingoistic. But it's not just Americans who had better equipment than the Germans. The Germans would have been far better off just copying the Soviet T-34-85 than building the Panther, and the British Spitfire was better than the Me109E. The Stuka was a terrible plane, out-classed by the British Typhoon, the Soviet Sturmovik, AND American P-47, the latter of which was ALSO a better fighter than the ME109 and was probably better at high altitudes than the Focke-Wolfe (turbocharger, fuck yeah!). Both British bombers and American bombers carried more bombs, were better defended, and flew higher than their German counterparts. German tank destroyers were produced in astonishing variety, but probably only the Hetzer and Marder were worth the cost, while Soviet and American tank destroyers and assault guns performed superlatively. German U-boats were well-built, with good torpedoes, but American subs had far longer range and reasonably close maximum depth ratings (depending on the class).
I suppose the Me262 was a technological innovation that the allies did not match during the war, but the resources devoted to it would have been better spent on Focke-Wulfs, rather than trying to come up with wonder weapons that, in the end, were not significantly better at knocking allied bombers out of the sky.
In other words, the allies really did tend to have, overall, better equipment for winning a war, even if it didn't look as cool (and German equipment did look cool). And the allies, especially the Soviets and Americans, actually understood modern warfare as being an exercise in logistics and production, more than of training and fighting spirit.