Iranian-supported Iraqi militias injured two U.S. troops at Al-Asad Air Base in western Iraq in an attack this weekend.

These militias have now carried out more than 150 attacks against U.S. forces in Iraq and Syria who are stationed there to assist in the campaign to defeat the Islamic State since mid-October. Dozens of U.S. troops have been injured during these attacks, while two U.S. troops and one Iraqi soldier were injured in the Saturday attack, which Pentagon deputy spokeswoman Sabrina Singh described on Monday as “a larger scale attack than we have seen before.”