I think there was WWII motifs because at the time the original trilogy was being filmed, left over weapons, uniforms, etc were extremely cheap to buy and there was a lot of it available. Lot of material for low cost is always good for film.

Well according to Sony, you don’t own any even if you paid for them on their storefront.

Piracy has never been tried successfully as theft, because it does not deprive the original owner of their lawful copy. It has always been tried as Copyright Infringement.