Their name is enough to slap them. In German it sounds like.... Hmmmm.... Let's say it is on the silliness level of "BoatyMcBoatface"
It sounds like a Manowar song title or the name of a Diablo Monster. Like, you ask someone for their name and they keep a straight face while saying "just call me Death Killer the Blood Warrior of Death" Just over the top and silly. Why would anyone call their planet "war"? And combined with Death Korps (it is the German spelling of Corps) it pretty much prompts my reaction: "I GET IT. They look like a mix of Germans between WW1 and WW2. And yes of course they are badass and everything there sucks like everywhere else in the universe. And stop using German words so the most harebrained idiot also gets it. Jeez! That's just so uninspired and lazy" What's next? They call their boss Karl Franz or someth.... wait... nevermind.