Pretty sure those just belong to some company testing the potential for drone deliveries of some kind and long-term flight. Now if that company is military related or not is the real question. Aliens today are what demons were to people in the middle ages, some mythological bs made use of by the state to manipulate people.
This is why I suspect the drone/hologram stuff in the US is just increased wartime readiness and a way of keeping the local populace calm as military drills increase, but better to push aliens or Iranians