[Jedi Master Pikachu]

Granted, this is from Wikipedia: http://en.wikipedia.org/wiki/442nd_Regimental_Combat_Team , but it has the Nisei Regiment as the most decorated for how long it lasted and for the amount of people it had. So, the Marines could be the most decorated over all.

[Jack Hammer]

Yes, you're right. I just don't know. In any case, to be in the company of the United States Marines in terms of honors is an enormous achievement.