Jingszo !

FWIW, Artemis targets would explain both the 1200mph fast moving object and why the wreckage had balloon-like debris, though the claims of balloon-like debris are pretty dubious from what I understand. Additionally it would have been incredibly sensitive information at the time (and probably still is, I mean we still use the U2 because it's almost impossible to shoot the damn things down), absolutely justifying the X-Files-esque coverup that has been reported (again, pretty dubiously) as happening after the incident. I don't think that's what it was (for many reasons, mostly Artemis being a UK program that we have no public records of it being tested in the US outside of WSMR at this time), but it's yet another plausible explanation we're unlikely to ever have confirmed or denied.