I am from a country that was part of the Third Reich and several grand-family members had a hard time or died due to the Nazi regime - but honestly, my vote goes for historical accuracy not for denial.
Keep in mind though, that
publishing a game containing Nazi heraldry is indeed against federal law in most European countries. Even if the aim of the game is to kill as much "Nazi Soldiers" (which is historical nonsense of course), displaying the heraldry is still elegible to count as glorification.
But as long as its
- no commercial release
- provided as a download from a server outside of Europe
probably no one would really care.
In case you find my grammar and spelling weird ---> native German speaker ^^