With U.S. forces stretched thin and Iraqi security forces still months away from being able to assert authority, the fear is that the al-Zarqawi-led jihadists may carve out their own fiefdoms across the country from which they can recruit and train zealots to join their struggle--a version of the northwest province in Pakistan, which al-Qaeda has turned into a safe haven. The insurgents' aspirations are growing. Abdullah, a midlevel leader of Kata'ib, says he's happy U.S. troops are staying in Iraq: it means he can be part of the jihad. Asked what the jihadists will do if U.S. forces finally...