i was about to say, dont look even close to johnny or steve-o, not even close

So did America… and they raped at least more than a few million Vietnamese woman in a war they weren’t even involved in

It's a classic design in skateboarding (likely best known from the '90s _Shorty's_ 'Chad Muska' signatures), and no - there is no such thing as a symbol or flag banned in the US. Skateboarding is or at least had been counter-culture influenced by punk and hardcore where "offensive" symbolism always had been a thing. The Ramones played in _White Power_ sweaters, Sidney Vicious walked around in a red shirt with white circle and black swastika, and the Iron Cross as awarded in various german wars in between 1812 (if I remember correctly) and 1945 had been part of counter culture eversince teds, café racers in the UK and bikers in the US adopted it in the fifties.. The point is that this kind of symbolism in punk/skateboarding doesn't indicate support or something but is meant as a massive _"F☠️k you and you and you too, f☠️k you here and you over there - f☠️k you too!",_ meant to troll normies, claiming extremist symbols to "misappropriate" them within a culture particularly despised by and opposed to precisely the kind of authoritarianism these symbols had been meant to represent and last but not least it served/serves as an expression of a hedo-nihilistic attitude, the rejection of common social conventions, values and virtues, life goals and notions of meaning to instead hold absolutly nothing for holy and sacrosanct. By the way: According to common customs and understanding it's a grave offense to "disrespect" national flags with countries such as the US and certainly imperial Japan - and printing such a flag to the underside of a skateboard where it is turned over and close to the floor exposed to dirt without even having to get skated hard not to speak of the inevitable scratches and subsequent destruction of the graphic caused by actually skating transitions and/or street would certainly have qualified as deliberate offense and blatant disrespect in the understanding of WW2 era Japan as far as it concerned the imperial flags, and in the US there are very particular standards of how a flag has to be treated - it's not supposed to ever touch the ground, it's not supposed to remain hoisted at night, it has to get displaced if signs of wear become apparent, it has to be stored cleanly folded whenever not hoisted, isn't supposed to be hoisted upside-down unless as a sign of distress, has to be correct in design, coloration and proportions, has to be disposed of in certain ways and should never get disfigured, modified, or (worst offense of all) burned, and it shouldn't be misappropriated for mundane purposes such as making clothing from _Stars and Stripes_ printed fabric, worn as a cape or used to make cheese pickers look like miniature flags. It's not about the US flag here but it's a great example of how particular overtly patriotic/nationalistic states tend to be with their flags - a perculiarity which makes what might appear as condonation or support at first superficial glance into the perfect opposite. At bottom line it's the same as using said flags as doormats or handkerchiefs - a japanese admiral certainly wouldn't be happy about the flag getting used that way and it's not exactly unlikely that such an admiral would have killed you for an offense like printing it onto a skateboard. But don't get me wrong, I don't mean to devalidate your concerns - it's laudable that you are caring for such stuff, its historical implications and most importantly the many people who had fallen victim to an infamously inhumane regime. Props and all the best from Berlin! 🤜🤛