WASHINGTON (CNN) -- The only Iraqi battalion capable of fighting without U.S. support has been downgraded to a level requiring them to fight with American troops backing them up, the Pentagon said Friday. The battalion, made up of 700 to 800 Iraqi Army soldiers, has repeatedly been offered by the U.S. as an example of the growing independence of the Iraqi military. The competence of the Iraqi military has been cited as a key factor in when U.S. troops will be able to return home. "As we see more of these Iraqi forces in the lead, we will be able...