If the 71 could be created that long ago, there's no reason not to believe that with the exponential advancements in technology since then, the UAP's with their capabilities we're seeing today are real and they're not alien.
The acronym “UAP” is a diversion. It keeps you from remembering all the gubmint investigation failures/coverups.
re: “If the 71 could be created that long ago, there’s no reason not to believe that with the exponential advancements in technology since then”
Because, physics DOES set some hard limits given material property constraints, like, melting points, strength, so, “exponential advancements” soon reach a limit and “exponential advancement” is not possible forever.