US Air Force has secretly built a new penetrating STEALTH drone SR-71 replacement
• .Dubbed the RQ-180, will conduct the penetrating ISR mission that has been left unaddressed, and under wide debate, since retirement of the Lockheed SR-71 in 1998.
Dubbed the RQ-180, will conduct the penetrating ISR mission that has been left unaddressed, and under wide debate, since retirement of the Lockheed SR-71 in 1998.
