The U.S.-led coalition in Iraq withdrew from K1 Air Base in the northern part of the country on Sunday, AP reports.Why it matters: It's the third site that coalition forces have left this month as the U.S. gathers troops in Baghdad and at Ain al-Asad Air Base. The coalition handed the base over to the Iraqi military along with at least $1.1 million of equipment.The big picture: K1 Air Base suffered a rocket attack from an Iranian-backed militia group in December 2019 that killed one American contractor and led to the U.S.-directed killing of top Iranian general Qasem Soleimani.Go deeper: 2 U.S. service members killed by rocket attack in Iraq