Use silenced guns to kill Coalition forces at Iraqi security checkpoints, smuggle weapons in gradual shipments to reduce the risk of detection, and poison Iraq’s water supply with nitric acid to spread disease and death. Such tactics were fleshed out in a terrorist letter intended for Abu Ayyub al-Masri, the foreign-born leader of al-Qaida in Iraq. But the document never reached Masri. Instead, Coalition forces lifted it from the body of a terrorist they killed last month during an operation 30 miles northwest of Baghdad. The slain terrorist and author of the 11-page missive was Abu Safyan, from Diyala, Iraq, according to military officials who made available all but two pages deemed “not releasable” on the Multi-National Force – Iraq Web site.