Well here is how mine worked out for the VIIB...
It took quite a bit of fiddling with the location before I found a spot where the emblem was not replicating 4 times around the tower. It appears the majority of the tower section replicates twice on each side of the tower split down the centerline... with the tiles inverted to face each other on both sides.
The file I modified to add the emblem was: "NSS_Uboat7b_hull.tga" - just as the Big E described. This file is located in the \Data\Textures\TNormal\tex folder.
I tried to do a screenshot of the Adobe Photoshop PSD to show you the basic positioning of my emblem on the TGA file. I hope this helps!