Having been in the military and worked in IT for a number of years, I can tell you that the first thing you do when someone leaves is change access codes. If that someone was known to have malicious intent, extra measures are implemented to defend against that specific person. When I heard, "someone's using our access codes", what followed became implausible and stupid.
Also...using a high ranking person to get command codes only works if it isn't known that person is in enemy hands and then only if the command codes aren't changed on a regular basis anyway. This is a common TV-ism and especially ridiculous on a sci-fi show where making and communicating changes would be so easy.
Also...using a high ranking person to get command codes only works if it isn't known that person is in enemy hands and then only if the command codes aren't changed on a regular basis anyway. This is a common TV-ism and especially ridiculous on a sci-fi show where making and communicating changes would be so easy.