The blast doors are never to be left open if one of the crew members inside is asleep - as was the case in both these instances - out of concern for the trouble an intruder could cause, including the compromising of secret launch codes.

Transgressions such as this are rarely revealed publicly. But officials with direct knowledge of Air Force intercontinental ballistic missile operations told The Associated Press that such violations have occurred, undetected, more times than in the cases of the two launch crew commanders and two deputy commanders who were given administrative punishments this year.