Also guns..... almost every American soldier came already familiar with the use, cleaning, and handling of firearms.
And we had team sports that trained all those soldiers in how to interact as a team.
I used to play a tabletop game called Squad Leader (Avalon Hill) that did a fair job of simulating the general behaviors of the various forces in WW2. Americans ride everywhere, they use and discard vehicles like candy. The morale may break quickly in a surprise but they recover independently and regroup faster.
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