This topic brings back memories. I spent 3 years in the infantry stumbling around in the dark. I've ripped through "wait-a-minute" vines in Kentucky, bounced off pine trees in Louisiana, and waded through cold Georgia swamps in pitch black. I've been in forests so dark and nasty that not even a nice set of PVS-7B's will show the way. Some of my most vivid memories of being in the Army are of seeing troops creeping through the woods in a grainy-green hue, or bathed in silvery light.<br><br>BTW, blood is very hard to discern with night vision devices and red-lens lights. Personal experience sort of thing.