[gap]

here are a few similar discussions hosted in various gaming forums, mostly about tracer bullets used by WWI and WWII Air forces:

http://forums.bistudio.com/showthrea...colors-correct
http://forum.keypublishing.com/showthread.php?t=82846
http://iaaforum.org/forum3/viewtopic.php?f=8&t=11524
http://www.professionalsoldiers.com/...ad.php?t=13722
http://www.theaerodrome.com/forum/ai...er-colors.html
http://forum.1cpublishing.eu/showthread.php?t=12320
http://forums.ubi.com/showthread.php...Where-to-find?