Not too long ago, a colleague brought the Achtung! Cthulhu
setting to my attention via imagery of its appropriately disturbing miniatures. Now, to be fair, the idea of the Nazis messing with the paranormal in an attempt to stave off the encroaching jaws of defeat is hardly an old one (the older Wofenstein games use it as a MacGuffin)... however, the Valkyria Chronicles setting permits a nasty reversal of the trope.
Imagine, if you will, a scenario where Squad 7 encounters a small taste of such horrors from beyond... and later discover that this is not the work of the Imperial forces, but rather a cabal within their own armed forces who have let desperation overtake common sense.