Why would the military, or government risk so much, when it would be far easier and cheaper to buy some grateful rancher's cattle and take them back to a lab for a PROPER investigation, under rigid scientific controls, than to RISK getting caught (lot's of cameras and video equipmewnt out there) or even spend enormous amounts of money on pay, fuel, and equipment to fly in at night, cut up an animal, then get out of dodge before getting caught? It simply defies logic.
I do think something wierd was going on. I remember how frightening the events of the 1970s were. I worked with a Lt. Colonel who did go and do some at the sight investigations, and the stories he told would make the hair stand up on the back of your neck. He thought it was UFOs. I don't know what it was, but do believe it happened. But the USA wasn't doing it.