Is the time coming for Marines in Afghanistan to spread out and fight insurgents in more provinces? Maj. Gen. Richard Mills, commander of Marine forces in Afghanistan, made that case in interviews over the weekend, telling reporters that as the Corps continues to push insurgents out of population centers in Helmand province, they may need to expand where they are operating to places ranging from the Iranian border to neighboring Uruzgan province. He added that a small number of forces under his command Marines already are operating in neighboring Kandahar province, where Army forces have been locked into a struggle with…