In 2002, the U.S. military had just two kinds of camouflage uniform. One was green, for the woods. The other was brown, for the desert. Then things got strange.
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.
Even the air force has its own unique camouflage, used in a new "Airman Battle Uniform." But it has flaws. So in Afghanistan, airmen are told not to wear it in battle.