I think that's one of the reasons why I picked up the MK1 in the first place ... I was in the Navy 1980-1985 (submarines). My Kraton-handled MK1 came with a hard plastic/nylon sheath which is unmarked, but the blade is stamped "USN". I like that.Been intrigued many times but like said before there has always been something else. The coating puts me off too. Something about leather stacked handle and coated blade doesn’t work for me. I think they also could offer the sheath without the USN stamp - no disprespect but because I’m civilian.