The books is by Paul Kennedy. It walks through the technological changes but not just that but changes in bureaucracy too. For example the inter-service rivalries in the U.S. had to be managed and even a concept like having a headquarters ship had to be developed.
But one thing emerges – the Nazi’s were really sons of bitches, Hitler prime among them. From the U-boats that were dispatched by the allies by using aircraft to the whole Blitzkrieg concept. Germany has a fairly up to snuff military in the 1930’s – and the military units they faced like that of France, Poland and even Russia to a degree all hadn’t progressed sufficiently enough from the technology of World War I. And Germany took advantage of that fact. And the Nazi Germans used some rather devious field maneuvers.
A great example – the Russian T-34 tank. The Russians had actually sent one to the Aberdeen proving grounds in the U.S. for testing. What came back were recommendations to rectify stiff controls, better gun turret, etc. The Aberdeen folks did like the sloped design of the T-34 though. (All images – click to embigen)
Consider – tanks prior looked like these:
And of course today tanks look more like this, An Abrams M1A1 – that baby has a turbine for an engine.
One interesting thing to note. In the U.S. Army – the three man crew of an M1A1 – they rotate duties. Today you might be the commander of the mission, tomorrow you might be gunner, or driver. Keeps everyone sharp. I like that. Hell if I’d had to join the Army I definitely would have gravitated toward tanks.