By closing themselves to the US "feds" community, do they open themselves up to the larger international black hat community? I would imagine that any foreign

By closing themselves to the US "feds" community, do they open themselves up to the larger international black hat community? I would imagine that any foreign black hat would have reservations about going to DEFCON. In fact, the DEFCON community probably benefits from diversifying globally by being held in other countries. I don't know anything about DEFCON, but how diversified is the audience that attends? Historically, have the overwhelming majority of non-fed attendees been US citizens? I would imagine that both Germany and Israel are well represented in the community. If so, how do they attend without risking being put on a no-entry list at the border?