An attitudinal sea change. I think that's the hardest one to fix. Presidential directives, bills, provisions can all be rescinded, repealed, amended, but attitudes linger. The hardest thing is going to be to try to reverse an attitude, a bunker mentality that equates secrecy with either security or heightened efficiency and that regards transparency as an invitation to mischief and trespass. This default position of operating in the shadows is going to be somewhat appealing to whomever inherits office.