In 2002, the U.S. military had just two kinds of camouflage uniforms. One was green, for the woods. The other was brown, for the desert.
Today, there is one camouflage pattern just for Marines in the desert. There is another just for Navy personnel in the desert. The Army has its own “universal” camouflage pattern, which is designed to work anywhere. It also has another one just for Afghanistan, where the first one doesn’t work.