Yes, although not at that scale. - Several products from the Lockheed Skunk Works, including the U-2 and SR-71 reconnaissance aircraft and the early stealth ai

Yes, although not at that scale. - Several products from the Lockheed Skunk Works, including the U-2 and SR-71 reconnaissance aircraft and the early stealth aircraft. - Russian titanium submarines - The original US spy satellites, the CORONA program. - At the moment, China building aircraft carriers. They're built in shipyards that also build container ships, and it's hard to tell from the air which hulls are military.