The cost of running U.S. military operations in Iraq has been averaging $7.5 million per day since mid-June, according to the Department of Defense (DoD).

Pentagon spokesperson Rear Admiral John Kirby told reporters last week that the costs of DoD’s humanitarian and military operations in Iraq have fluctuated daily since beginning on June 16th. Daily costs did not start out at $7.5 million per day, he stressed. “As our OPTEMO and as our activities have intensified, so too has the cost,” he said.

But, the latest figures DoD has compiled show that through those costs have averaged $7.5 million per day through August 26. That would mean that DoD has already spent over $500 million in Iraq.

Kirby said these costs are being funded from current Overseas Contingency Operations (OCO) funding. Congress provided $85.2 billion for OCO in FY2014. Kirby said OCO spending in FY2014 is “well within the limits that we need for 2014.”

Kirby cautioned that the situation in Iraq is still fluid and DoD and the State Department are continuing to plan and review options Costs will change as the level of operations, especially air strikes change. There have been 110 air strikes in Iraq since they began, Kirby said.