WASHINGTON (Reuters) – The United States is carrying out strikes in Iraq against targets linked to Iran-backed militia, U.S. officials told Reuters on Tuesday, with one saying it was a response to a weekend attack on an Iraqi air base that wounded U.S. forces. U.S. troops in Iraq and Syria have been attacked about 150 times by Iran-aligned militants since the Israel-Gaza war started in October. On Saturday, four U.S. personnel suffered traumatic brain injuries after Iraq’s Ain al-Asad air base was hit by multiple ballistic missiles and rockets fired by Iranian-backed militants from inside Iraq…