The U.S. Army is scrapping its Universal Camouflage Pattern, a gray, pixelated design that has been used since 2004, reported The Daily (see an image of the pattern here). The pixel camo cost $5 billion to develop. It drew on neuroscience and research about perception and was believed to make soldiers less detectable in various terrains, saving lives. This theory was flawed. In Afghanistan, it will be replaced by a green design called MultiCam until the military can come up with a new pattern. But how did today's pattern evolve in the first place? Here's a look at various designs since before the turn of the 20th century.