First off, these are German soldiers, not American.
And they are SS.
And this isn't even an historical image. It's a picture of people reenacting the SS (which is another level of cringe.)
But this is just sloppy journalism.
The image can easily be found via Google reverse image search.
It's here on the website of @IntrepidHeroes (a thoroughly admirable charity helping American soldiers with PTSD).
But, in this era of "both sides" and resurgent white nationalism or people who probably would hang such photos in their houses, organizations need to do some VERY BASIC diligence.
(note: I don't think they tweeted the image and I'm not sure what their viewing numbers are)
We can do better.