So Secret They Forgot Where They Put It

Then of course, they get a lot more money. I wish I had that deal every time I misplace the car keys.

How the US forgot how to make Trident missiles

"PLANS TO refurbish Trident nuclear weapons had to be put on hold because US scientists forgot how to manufacture a component of the warhead, a US congressional investigation has revealed.
The US National Nuclear Security Administration (NNSA) "lost knowledge" of how to make a mysterious but very hazardous material codenamed Fogbank. As a result, the warhead refurbishment programme was put back by at least a year, and racked up an extra $69 million."