If you are in the American campaign, in your "office", before starting a new patrol, you have next to the "save" books, a radio (it is for me), if you point the mouse at that radio, you will see the word "Options" appear, click on the radio and later click on "Gameplay settings", you will enter in a menu where you can choose which realism features you want to play with. You can select full 100 realism and save that configuration even if you selected "easy" when you started the campaign.
If you are in the German campaign, you have to click on the "drawers" next to the briefing map, to enter the Options menu
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