I have no clue but my uncle might... But he dislikes talking about Desert Storm Era. I do not blame him. All I ever got from him was to avoid any sex without knowing who the "partner" was. Appearently almost an 8th of his squad were banned from re-entering US because of some weird STD. It's effects sounded very... Unpleasant.
But I assume that's nit what you were looking for. So I have no idea other than google, but I have no extensive knowledge of the filters in place there.
Best in Osaka is Shinsaibashi, Dotonbori, Osaka Castle and last year i had complete the tour of Osaka these places are charming in Osaka and i suggest to you that you must visit these places..