These types of ahhh...devices, can be found along the southern USA border, looking for illegal crossers, Mexicans mostly.
They are very good at the job, so good in fact that a lot more have been ordered, and yes they look very similar to what EGCCrny24 observed.
Could be the same, I suspect.
Now, as for the 'real' flying saucers, IE: those spotted in the late 1940's early 1950's in the vicinity of the state of New Mexico, these were undoubtedly visitors from far away, who noticed the bright flash in the New Mexico desert on 16July1945...and just wanted to have a look to see how 'advanced' we were.
Having decided that those funny folks on earth had a long way to go, these visitors quietly went away, secure in the knowledge that we would be killing far more of our own, long before we would pose a threat to 'others'.
Or something...
