Assume they got a local to take a photo. That means a minimum of ten Marines didn't know about the SS logo.
If 99% of Marines don't recognize the SS logo, then your statement is 90.4% likely to be true. If only nine out of ten don't recognize it, the probability drops to about 35%. If as many as one out of five does recognize it, then the statement is about 11% likely to be true.
I wonder how Marine knowledge of Nazi history compares to that of the general public. I'll bet LTC Oliver North would have recognized it!
The guys in that picture all look to be under 30. Ollie is what? pushing 70?
You’re expecting knowledge of the connotations of a text font with respect to history. Chew on that for just a moment. While I know it, and you know it, I expect we are both closer to Ollie’s age than to these Marines’ age.