Here is the pre-1939 patch for the 45th Infantry Division...
and the patch that replaced it when the symbol became closely associated with the Nazi Party in Germany... the 45th became the Thunderbird Division
the 45th is one of the American Divisions recognized for liberation of concentration camps by the Holocaust Museum...
Both symbols are of American Indian origin... my previous comment still stands... notice that the ends of the swastika point in a clockwise manner... the one on the grip frame is backwards...
BTW, I am sure Hugh Clark could make you a set of grips like those, only the workmanship would be MUCH better... notice the border around the diamonds is not even on this example...