So I was at a local book store today thumbing through a few magazines when I came across an article that caught my attention. It was about the history and use of mirrors that troops and LEO's would hide behind unseen. The mirror would be angled to reflect the surrounding landscape while the soldier/officer would lay prone behind it with their rifle aimed through a small sliding "window" in the middle of the mirror. The result, when viewed from the enemy's position, was an invisible fighting (or hiding) position. I mean, you just couldn't see the thing. The user did have to account for sun glare and the like, but when setup correctly the shooter was invisible. The article, if I remember correctly, said the Germans invented this technology in WWII and that LEO's in America adopted it when moving in on buildings where there was no cover around them, only wide open land. Word got around about the successes of using the device and soon it found it's way into military hands. The magazine was SWAT, if I'm not mistaken, and it was a pretty entertaining article. They not only showed pictures of correct usage, but incorrect as well. Oh, and I think they said it was made of polished aluminum, not glass.