December 2019 United States airstrikes in Iraq and Syria

Significance

On 29 December 2019, U.S. forces struck Kata'ib Hezbollah weapons depots and command centers in Iraq and Syria, killing at least 25 militiamen and wounding 55 more. The Department of Defense framed the operation as a direct response to a pattern of attacks on Iraqi bases hosting Operation Inherent Resolve coalition forces, culminating in a 27 December strike on a Kirkuk airbase that killed an American civilian contractor. The strikes marked a significant escalation in the low-intensity contest between U.S.-led coalition forces and Iranian-backed militias operating in Iraq, drawing Kata'ib Hezbollah — a Shi'ite militia funded by Iran — into sharper focus as a principal actor threatening coalition presence. Kata'ib Hezbollah denied responsibility for the preceding attacks, and the strikes contributed to a rapid deterioration in U.S.-Iran tensions that would intensify in the days that followed.