Been reading up on the A2 and heard about this. So, is there a reason for the yellow-green, aside from the similarity in cockpit illumination? My understanding of the various LED colors and their benefits is like this:
White - general purpose, good color rendition
Red - preserve night vision
Green - 'brightest' color since our eyes are very sensitive to green light; works well with night vision equipment.
Blue - improves contrast, helps blood stand out so is good for EMTs and for hunters tracking wounded game.
So, what does yellow-green do?