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yeah I think it's more likely that it's some kind of experimental propulsion test that is sometimes being noticed. Like they wandered into a room above their clearance level or something. Someone on earth made these.
Can you provide an example of a past technology that was unimagined by mainstream physicists and that was sucessfully implemented in secret and kept secret for decades? I can't think of anything. Fission bombs were widely believed to be physically possible, were developed in secret but used publicly within several years. I do not beleive the military has some secret antigravity, inertia modifying technology or warp d…
I really don't know enough about military history to answer the question but if a research lab had some kind of groundbreaking tech like this it would make sense to me for them to try to keep it under wraps.
It does seem unlikely that they'd be able to keep the secret this well though. I'll give you that.