Well if we assume Archangel and Eternal went to Orb after the war (which would probably be most likely since there's that scene with Andy and a bunch of Orb people), they would have all kinds of data (the Strike's, Justice's, Freedom's, and Buster's combat data), along with what was aboard the Kusanagi. So unless Orb was under Alliance occupation it probably wouldn't be too hard for Orb to rebuild it's military even with out Morgenroter.
And if the MAHQ is anything to go by, Orb would probably also have the data on the Astreys, Sword Calamity, Duel/Long Dagger, Forbidden Blue, and Raider Full Spec units.