The U.S.–Israel war on Iran has reignited a long-simmering front in Iraq, where resistance groups like Kataeb Hezbollah and the Islamic Resistance in Iraq are launching coordinated drone and missile attacks on American targets, including Ain al-Assad airbase and facilities inside Baghdad’s Green Zone. What Washington once declared finished in 2003 is rapidly unraveling into a new phase of war — one defined by blowback, as battle-hardened Iraqi factions degrade U.S. defenses and push American forces out of Iraq.