Susan:
The color scheme for MS-DEFCON sort of looks like my flower garden, but it conveys no message corresponding to the five conditions. Here is a suggestion:
The first three conditions should be in RED (you know, like a traffic light) with “1” in the brightest color and then shading or lightening down to PINK for DEFCON “3.”
Then switch the current GREEN in DEFCON -4 to DEFCON-5 and use a bright yellow for DEFCON-4.
Almost no one would misunderstand the meaning with a scheme like that and readers would almost certainly process the information much faster than mentally trying to recall exactly what each DEFCON condition means. The definitions and numbers wouldn’t be changed, of course, but changing the colors would convey the sense of each condition.