I have given my reasons to keep kelly green before (trademarking, instant recogniton) so I will not get on that diatribe now.
The main reason they used to get us into the darker green was that the kelly green dye was too hard to find. I was just in the Philipines for the last week and saw literally dozens of fabric stores, they ALL had several different types of fabric in the kelly green spectrum.
Don't let anyone tell you otherwise, If a MU official tells you that, tell them to talk to me. I can tell them how to get it, and get it made in china/Thailand/ Saipan for a hell of a lot less than they are paying for it now.--probably