4 ms·

They kept a Mach 3 plane secret for a long time…

• nradov 4y ago
  No they really didn't. The Soviets, North Vietnamese, and North Koreans all detected and tracked the A-12 / SR-71 planes during operational missions. They didn't know all the details, but the existence wasn't at all a secret to our adversaries.
  • FredPret 4y ago
    It was secret from the public. Which means there are certainly military projects right now that are also secret from us, even if Russia knows