Why does the Government Classify The SR-71 Blackbird top speed

Its been many years since the Blackbird has “retired” and the actuall top speed. The top know speed is mach 3.5. In my vision the only legitiment reason the government would still have its actuall top speed classified is becuase they still secretly use it. What do you guys think of this and why do you think the government classfied this. And the USA Government classifies lots of things for weird reasons.

History Channel Guy Aliens

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