To keep insurgents from retaking towns, US troops are now setting up local camps.By Scott Peterson | Staff writer of The Christian Science Monitor FALLUJAH, IRAQ - As US Marines battle insurgents in a string of towns in Iraq's western Anbar Province, they are applying lessons learned from their experience in Fallujah: Flush out insurgents, then stay there. Some of those farming towns, along the Euphrates River, have been cleared and cleared again up to three times during the past year, as militants reestablish their grip when US and Iraqi forces depart. Now marines are setting up temporary camp in...