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I've read about how the TR-3B is the human pattern and the more advanced aliens only use discs and "sigar" shaped ships.
Basically if what I've read was correct the aliens shortly after the Roswell incident contacted the US and the US representatives gave them permission to kill a restricted number of cattle and humans for DNA in exchange for their technology.
People also gave them the coordinates of their defensive sites and other sensitive data so the aliens basically fucked them over thanks to those simpletons they dealt with and they gave them deceptive instructions.
The triangular UFOs are supposedly radioactive for this reason but I don't know if that's the case. Certainly would explain all the dead cattle cut up with lasers and the abductions concentrated around certain areas.
Also how people get sick around some UFOs.