If you don't know what something is, then how do you know it's not a threat?
That doesn’t imply that if 3) is true that it’s not a threat.
Although, haha, now that I read again, my original conclusion is wrong. If 1) and 3) are lies then that means the drones belong to the USG and they know it. Therefore that would mean that the drones really aren’t a threat. At least not to the USG.