If the DOD is coming out and yelling "squirrel" my first inkling is that it is a disinformation campaign to draw attention away from - I don't know - secret antigrav technology we may have developed.
But then there's the whole alien encounter subject. As a Christian I absolutely believe that God sends angels to interract with us (I suspect I may have entertained one unbeknowest at one particular a critical moment in life) so the idea that the adversary has sent demons is a metaphysical leap in belief I am willing to take.
Whatever the phenomenon is, skunkworks, ET, demons, or some combination, they sure don't want the public to see the full picture, but they either screw up from time to time, or have some agenda that includes limited exposure to the public, or else we wouldn't be discussing it now.
Drip, drip, drip...