This report discusses the relationship between Iraq and Iran in the post-Saddam Hussein era, with particular focus on what Iran's intentions and/or long-term goals may be for increasing its influence in Iraq. The report explores the various strategies that Iran has used to spread its influence throughout Iraq's military and political spheres. The report also addresses the United States' concern over the Iran-Iraq relationship, especially as it concerns armed Shiite factions and U.S. efforts to stabilize Iraq.