A friend of mine was a (professional) car photographer and was covering some historic military vehicle event. Taking pictures of an enthusiasts army truck he casually asked if some of the uniformed guys nearby could stand by the truck. The owner immediately said very forcefully "I don't want any of 'them' anywhere near my vehicle".
Evidently there are vehicle enthusiasts who tinker with and preserve old army vehicles, and there's also the dressing up and playing soldiers faction, and there's a big gulf between the two. I don't recall if they were dressed as Nazi stormtroopers or not, but it has to be said that even the dressing up as Yanks lot often seem to have an unfortunate fondness for Confederate flags.