There is a lingering story that the launch code for USAF ICBMs was just all zeroes. This has been refuted by the pentagon but the operator's manual suggests it

There is a lingering story that the launch code for USAF ICBMs was just all zeroes. This has been refuted by the pentagon but the operator's manual suggests it is normal practice. https://sgs.princeton.edu/00000000 https://sgs.princeton.edu/00000000