Deputy, you don't say how many patrols you've done or what your tonnage and kills are, though I'm guessing you've done quite a lot to get your oak leaves!
On my most recent career using stock SH3 my captain earned the Iron Cross, 2nd class and the u-boat war badge after completing his third patrol. At the time I presumed to have earned these from passing unspecified patrol, tonnage and warship milestones.
Therefore I would guess that these are related to the number of patrols completed and your tonnage (possibly with a breakdown for merchants and warships), though this is entirely speculation on my part.
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