That's why they have security clearances. Remember, Bechtel builds most of the US's nukes, Lockheed Martin developed the F-117 when it officially didn't exist,

That's why they have security clearances. Remember, Bechtel builds most of the US's nukes, Lockheed Martin developed the F-117 when it officially didn't exist, and the same was true of Northrop-Grumman and the B2. Private firms are regularly entrusted to perform functions that require the highest levels of secrecy. And, as much as it may tickle our nerd fancy to think so, Stuxnet was nowhere near as important as nukes or stealth technology during the Cold War.