In the "Anchors Aweigh" chapter of the Snippet Collection, Yui checks in on her old unit, the Imperial Royal Guard's White Fang Test Flight, afraid that they'll piss off everyone with their YAMATODAMASHII, and is pleasantly surprised that her old XO Amamiya is keeping a cool head. She then checks in on Skull Flight, and is at first relieved that Focker's keeping a cool head and reminding his pilots their adversaries are their allies once the exercise is over... until Focker drops this bombshell:
The end of exercise reveals Both the US Navy and US Army lost to the US Marines which their leader Captain Wilbert D. Collins tells the Navy to "suck it!" Their defeat was so humiliating that both the Army and Navy end up Drowning My Sorrows together.
And then Yui ends up joining them, after the USS Porter nearly kills the President and Air Force One.