As the U.S. military continues its war against the Islamic State (ISIS or ISIL), the Air Force is reportedly dropping so many bombs that it is struggling to find more.

“We’re in the business of killing terrorists and business is good,” Air Force Secretary Deborah Lee James said in statement quoted by USA Today on Thursday.

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The U.S. has conducted roughly 6,700 strikes in Iraq and Syria during the campaign.  Transparency group Airwars estimates those strikes have killed as many as 977 civilians, though Baghdad-based military spokesman Colonel Steve Warren said Wednesday that it is “the most precise air campaign in history.”

Defense Secretary Ash Carter told a House Armed Services Committee Tuesday, “Over the past several weeks, because of improved intelligence and understanding of ISIL’s operations, we’ve intensified the air campaign against ISIL’s war-sustaining oil enterprise, a critical pillar of ISIL’s financial infrastructure,” and added, “There’s more to come, too.”

USA Today reports that with “more than 20,000 missiles and bombs” dropped in the campaign, the Air Force is “depleting its stocks of munitions” and has been forced to “scour depots around the world for more weapons and to find money to buy them.”

Warren added in his statements to press Wednesday, “In October, approximately 60 percent of all strike missions had one or more aircraft drop munitions. That rate increased to 65 percent in November. Overall, the rate has steadily increased since the start of OIR [Operation Inherent Resolve] and is up from approximately 50 percent in July and August.”