BAGHDAD, Iraq – Eleven more U.S. troops were slain in combat, the military said Wednesday, putting October on track to be the deadliest month for U.S. forces since the siege of Fallujah nearly two years ago. The military says the sharp increase in U.S. casualties, 70 so far this month, is tied to Ramadan and a security crackdown that has left American forces more vulnerable to attack in Baghdad and its suburbs. Muslim tenets hold that fighting a foreign occupation force during Islam’s holy month puts a believer especially close to God.