The Vajra are anti-UN forces...check this out...the octos mecha in macross zero transform like the red type vajra...the big machine in the VFX-2 game that is 4 legged is similar to the octos and red vajra,is also anti-un property....In macross 0 dr. hassford got a blood sample from sarah nome, the anti-un forces have kept the existing data from dr. hassfords studies of the mayan island and the birdhuman, those who survived space war I have new anti-un followers aboard macross galaxy...maybe through genetic manipulation and experiments, they developed sheryl nome as a clone of sarah to sing the song of destruction...the vajra are the smaller or production versions of the birdhuman. since the vajra are biomechanical. how they got the data to produce the vajra is probably because someone working with aries is a double agent aboard the Asuka in macross zero stole the data with the blood dripping from the birdhuman...he/she survives space war I also. sheryl must be the puppet of the anti-un and uses her celebrity image as a front because in the end, after destroying macross frontier, the anti-un who i think is composed of zentran, meltrans, humans and even zolans will strike at the many different fleets scattered across the galaxy to take over the NUNS.