[frau kaleun]

AFAIK there is no way to add additional medals into the game, if anyone knows otherwise feel free to elaborate on how this is done.

I can see why adding the U-Boat Front Clasp in silver would be an interesting idea, at least from what I know of it... even though very few men would've lasted long enough to merit getting it. In RL very few of them appear to have been awarded either version when compared to the number of ICs (and its various "upgrades") that were awarded. Just getting the bronze version probably took a lot - it seems to have been a decoration for extended or unusually exemplary performance in combat. It wasn't even introduced until 1944 (bronze in May, and silver in November).

According to uboat.net, the German Cross in silver was only awarded to non-combatants - combatants would receive it in gold if the award was merited at all. So adding that as a possible decoration for a combat commander would not be historically accurate anyway.

IIRC the only person awarded the Grand Cross after its reinstitution in 1939 was Herman Göring, in recognition (ostensibly) of the outstanding performance of the Luftwaffe during the German offensives up to and including the successful occupation of France. Considering that he was also awarded a special rank at that time, one created just for him so he could outrank pretty much everyone else in the Wehrmacht, it seems unlikely that a comparatively low-ranking u-boat commander would ever get his own Grand Cross. I think the award itself was originally intended only for the most successful generals (or high-ranking leaders) of the German military and its various branches.

According to Wikipedia, the Star was only awarded twice in its entire history - once to some guy who led German armies to victory over Napoleon, and then to Paul von Hindenburg in WWI. In other words: not an award that would be handed out for anything other than leadership, service, and/or success at the very highest level. When it was reinstituted in 1939, it was only to be awarded after Germany won the war and then to only one man, her most successful general of the entire conflict.

Obviously there was no victory and it was never awarded. In terms of historical accuracy, there would be zero chance of a u-boat commander ever getting this blingy pinned to his uniform.