— -- So far, the American military campaign against ISIS has cost $2.74 billion. That's an average daily cost of $9.1 million.
New figures released by the Defense Department provide the first detailed breakdown of costs associated with what has mainly been an air war against ISIS.
Daily flight operations have cost $1.501 billion -- or 55 percent of the total amount of $2.74 billion.
Both the Air Force and Navy conduct airstrikes in Iraq and Syria, but Air Force costs make up 67 percent of the $2.74 billion spent so far, according to the figures released.
A similar percentage is reflected in the average daily cost, where Air Force costs make up $6.1 million of the $9.1 million spent daily.
The figures also show that $646 million has been spent on the munitions used against ISIS.
The American strategy against ISIS also includes missions to train the Iraqi military and moderate Syrian rebels.