really none? how about the Allies use of secrecy in policy during WWII. I suppose that you would argue that the manhatten project updates be sent directly to all parties in the war, both axis and allies? Announce D-Day months in advance? gotta keep things transparent after all even if your opponent wont.
transparency in diplomacy most often results in gridlock. transparency in industry often leads to collusion. transparency in strategy allows your opponents to come up with effective counter strategies that you will not have the same access too. lastly, transparency does not keep people from jumping to conclusions. in fact transparency often causes people to jump to conclusions simply because they dont want to wade through all the facts.
i agree that we need more transparency here in the US, but blanket transparency is unwise at best.