Lonnie Zamora Socorro Sighting A Hoax?

Although extremely old news (40+ years!), the Soccorro sighting, you know, the one where the deputy saw two beings leap into a craft and take off, has always been super controversial.
Here's some evidence that it was hoaxed, supposedly. These old dudes say they did it, as part of this 'culture of pranksterism' at NM Tech. And since they're old, why would they lie?
I don't deny that Socorro was a hoax, nor do I necessarily believe that it wasn't. But whether or not these hoaxers existed, which they apparently did, and whether or not they had a fondness for hoaxing UFO's, which they also apparently did, it doesn't say how they managed to get the UFO that Zamora saw to turn green and shoot off into the sky, which is what he's always said it did.