Is that when we’ll get paid back?
While the U.S. occupied Iraqi the Iraqi military was mostly refitted with U.S. weapons and equipment. That makes them a U.S. customer for arms, spare parts, technical services, etc. They can get a lot of this stuff from third parties but it cost more. Under Bush the plan was to turn Iraq into a trade partner so they could buy American goods with their oil money. That is happening anyway but by pulling the combat brigades out Obama has invited Al Qaeda back in. Al Qaeda can foment enough tension to get the factions fighting each other and everything goes to hell again.