User blog comment:SlyCooperFan1/Falken Factory?/@comment-4503347-20120805141203/@comment-1824272-20120805185436

For that last note, it's true; there was a flight of one X-02, one ADF-01F FALKEN, and one ADFX-02 Morgan flying over the stadium in November City during the "peace" ceremony, as part of the airshow. They were there before or while Wardog performed their ceremonial flight. The X-02 was shot down in battle, I believe, and sent to Sand Island for repairs. You can see it in the cutscene directly after that mission.

Hmm... it makes sense that the Gray Men would give the FALKEN's plans to Yuktobania. With Grunder Industries already done with their own model, if the Gray Men sent the plans to Yuktobania and gave their prototype to Osea, it would further their effort to make both countries powerful enough to exhaust each other in this never-ending war.