How far ahead might technology and science be behind closed doors?

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Even though exact black projects numbers are unknown, it’s still a given that the government spends tens of if not hundreds of billions each year on SAPs and other R&D projects. They’ve been spending like this for decades constantly in the billions, and barely declassify anything. Might they be way of head of the general public in terms of both knowledge and technology? How far ahead? What about private industry? What fields might be most developed and far along? What are the implications of secrecy being wrapped around such potential advancements?