(NEWSER) – It's reassuring to know the people entrusted with the launch keys to our nuclear missiles are at least well rested—if not well secured. US Air Force officers in charge of these keys have been caught twice this year napping while leaving the blast door to their underground launch center open, the AP reports. The door is far from the only line of defense between a terrorist and the 10 Minuteman 3 missiles housed within—the bunkers are underground and guarded by many layers of security. And one of the two officers on duty is actually allowed to catch some Zs while on a 24-hour shift. But doing so with the blast door open is still a big no-no.