it's called projection of power and it's a major doctrine of the us military. the us military wants to show off its new capabilities to its enemies without putting any of it in harm's way. they also don't want to give away any specifics. so they deploy it in high-populations in the united states and let it generate hype and let people take pictures that get shared and uploaded across the world. this isn't the first time the us has done this- specifically spoofing the public into thinking they were seeing alien ufos when showing off new aerial technology. it happened in the 60s with the blackbird, and it happened again in the late 80s with the stealth bomber.  the ufo bullshit gives the story hype, but enemy intelligence agencies aren't stupid. they know what this is, they know what they're looking at is the us showing off is military capabilities.
United States