Definitely interesting films.
If you filter out the chest thumping propaganda in some of the films (understandable considering what was happening in the world at the time) it is truly amazing how, around the world, the military and science/technology was so drastically changed in just a few years.
As an example, in the 1930's during the depression, some U.S. Army units trained and conducted field exercises using broom sticks for rifles and pieces of stove pipes for machineguns. Participating soldiers had to pretend to shoot their imaginary weapons.
Then by the early 1940's there was a flood of new technology around the world. Including the VT fuze with its amazing (for the time) electronics and power supply and how this technology drastically changed/enhanced the use of ordnance and artillery.
No micro chip technology back then!