We are not aware of any regulation that bans the display of the confederate flag. However, we have seen local policy letters preventing the display of the confederate flag. If a commander determines that the display of the Confederate flag is detrimental to the good order and discipline of the unit, then the commander can ban it. Any extremist group propaganda or support, for groups such as Black Panther, Nazi, Motorcycle Gangs, etc, are prohibited by AR 600-20, paragraph 4-12.