Camouflage is a military invention, of course, and it has a longhistory. U.S. troops first tried camouflage in the late 1800s, whenthey spread mud on their blue uniforms to blend in with theirsurroundings. Olive drab and olive green were tried next, until the1970s, when researchers developed the popular black, brown, green,khaki camouflage. Desert action led to light brown, tan, and greencombinations being used for camouflage. Computers jumped into theaction in 2004, with a computer-generated randomized green, tan,and grey camouflage that helps soldiers blend in urban, woodland,and desert settings. Research continues, as science and technologyattempt to perfect the art of blending in.