There are plenty of people who make really big mistakes by trying to approach bison or bears in Yellostone National Park. Those animals are harmless, too---if they are unmolested. It is probably the military's OBSERVATION that they are so far harmless, and the deduction that if they were of harmful intent, that would have been clear at the outset.

It does seem that they have some kind of proximity detection, and if they are the size of an SUV (as claimed), you have no idea if they are carrying the equivalent of the Mother of All Claymore Mines aboard as a fireworks greeting for any amorous intent. You don't want half a dozen of self-forging steel needles to zip through your helicopter wall, through you, and out the other wall.

There are plenty of people who make really big mistakes by trying to approach bison or bears in Yellostone National Park. Those animals are harmless, too---if they are unmolested. It is probably the military's OBSERVATION that they are so far harmless, and the deduction that if they were of harmful intent, that would have been clear at the outset.

It does seem that they have some kind of proximity detection, and if they are the size of an SUV (as claimed), you have no idea if they are carrying the equivalent of the Mother of All Claymore Mines aboard as a fireworks greeting.