Defcon Five: Three of these systems, actually. The Admiralty has its “strategic condition” levels, in both global and theater senses, ranging from Six (“all is peaceful, quiet, tranquil, and frankly boring”) to One (“full-blown war, or, if this is the global level, galactic armageddon”).
Likewise, the Emergency Management Authority has its “civil emergency states” on a matching scale, where Six is “everything’s working just like it should, no trouble”, and One is “did anyone get the number of that asteroid?”; and the Imperial Security Executive has its “exceptional security alertness” scale, colloquially known as the “recommended paranoia level”, which runs Blue, White, Amber, Red, Violet, Black, where Blue is “nothing to see here” and Black is “total shitstorm, kill anything vaguely suspicious on sight, apologize later”.
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