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I must say that land units should gain EXP quicker - that is something which seems really nerfed in TRP. I have had armies fight all the way from poland, to north africa, to the middle east, then redeploy back to Europe at the Russian front and have less than 20 EXP.
My guess for land units is that the replacements are lower level, but in vanilla I've had Von Rundstedt lead every offensive through the conquest of USSR and have less than 20 xp.