Aeronautical
Meet the X-47B: America's $1.5 Billion Stealth Drone
Retired in April 2015, the U.S. Navy’s two X-47B, known by their call signs as Salty Dog 501 and Salty Dog 502, represent the …
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Retired in April 2015, the U.S. Navy’s two X-47B, known by their call signs as Salty Dog 501 and Salty Dog 502, represent the …
source
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