The military has announced ("announced" mind you) that they have updated the
launch codes for ICBMs. Sleep well.

See:
ONLINE EXTRA - Minuteman squadrons complete annual code change
The US Air Force's 91st Space Wing has completed the task of installing new
launch codes in its force of Boeing Minuteman III intercontinental ballistic
missiles (ICBMs). Each of the three squadrons had its codes changed in a
process that lasted for a week.
[Jane's Missiles & Rockets - first posted to http://jmr.janes.com - 22
September 2004]