"how'd a muppet like you pass selection?" seems to be a Modern Warfare quote - he has some Modern Warfare stuff on page 2 of his fandragons tab too so that tracks. I'm also thinking that this person is almost definitely not a nazi, even tho the Erika dragon (and Kaarina, which is a Finnish version of the same march) are imo in bad taste.

Probably one of those guys who are really into historical military stuff, they're a decently common sight in Finland in my experience.