now for the record i in no way support nazi-ism and whatever... i wanna say this first because i'm gonna give some potentially controversial views in a moment and i don't wanna get flamed/crucified on here for stating an opinion...
anyway... while the soldiers were either asses about it or REALLY didn't know what the symbol meant... i still see it as a GOOD thing it was used... look at the picture without the historical baggage of the symbol being used to identify Nazi SS... it looks pretty damn good dosn't it? it's actually kinda a neat/cool symbol without the historical baggage on it. now symbols are like words... they ONLY have the power that we give them. the word "fuck" is only a "bad word" if people believe it as such, and cringe when it's used or refrain from using it. now i'm not saying to use (in this analogy) fuck in every sentence... but at that point where its baggage of being a "bad word/curse word" is lifted, then it's just any other normal word used to express various things (TANGENT: i think the word fuck is actually an amazing word because it can be used to express so many things and can fit in so many parts of speech... i mean it's a noun, and adjective, a verb, everything.. it's a truly amazing word, but that's beside the point) anyway... if we use symbols like these that have that historical baggage then we can eventually wash away that baggage and make the symbols "good" again. now it's harder to do than the inverse... but it's still possible... these symbols were originally used by people other than who they're associated with now... the pitchfork/trident used to symbolize Poseidon... Greek god of the sea. a god who was revered and respected because of his power over the oceans. now... it represents villainy and evil because it is now used to represent the devil. same with the pentagram. (5 pointed star in a circle) in the pagan faith, it represents equality and unity. balance, and harmony... on Tarot cards(and by extension the culture that created Tarot...) it was used to indicate wealth and success. now we view it as a satanic symbol meant to be feared. and the Swastika... yes... the very symbol of the Nazi regime... well it used to symbolize something else... now according to Wikipedia ( http://en.wikipedia.org/wiki/Swastika ) the Hindu's used it to represent luck. hell the symbol was, in fact, SACRED... according to some sources Hitler knew this and used it on purpose either to bastardize the symbol, or to try and bring the symbol's power to benefit himself. (to bring him and his regime luck) so these symbols are only as "bad" as we make them... and if we release them from their bad historical baggage and start using them again in better context... then we can take that power away from them. and it becomes just another symbol... if we don't... then centuries from now... we may very well not have any symbols LEFT that we can use without being seen as "wrong" i can guarantee that eventually some "evil" thing will happen and try and conquer the world or something and you know what their symbol will be? the Christian Cross. then that symbol will be bastardized and shunned. and it WILL happen someday... probably not in our lifetimes, but someday. now we can either let this happen... or we can use these symbols freely and free them of that bad historical baggage so they can be used again. i say let the marines keep that symbol to represent them. they're (unknowingly or not) cleansing that symbol of its bad baggage and allowing it to be used once more... maybe in a few years, it will actually MEAN what they claimed to think it did...
now i have my own reasons for ranting on that... i happen to be Pagan and i quite enjoy the pentagram symbol that represents my faith... and i don't like every time someone sees it immediately associating me and Paganism with satanism... i'm trying to rid the pentagram of its bad baggage. i'd like other symbols to have the same done to them.
TL/DR: symbols, like words, are only as bad as we make them... if we freely use them, we make them powerless in that regard. let the marines use the symbol and detach it from the Nazi connection. and soon it may actually mean what they thought it did