The chair of the joint chiefs of staff told us the biggest lesson he’s learned in the fight against ISIS

The US has been able to greatly improve its use of intelligence over the 600-day fight against ISIS, the chairman of the Joint Chiefs of Staff told Business Insider on Tuesday.

“If you want to talk about lessons learned, I‘ll tell you, I’m probably relearning lessons over the last couple of years, and No. 1 is intelligence,” Gen. Joseph Dunford said in response to a question from Business Insider during an event at the Center for Strategic and International Studies.

“If you want to know why our operation’s quantifiably more effective today than they were a year and a half ago, it’s because our intelligence is getting much better,” Dunford continued.

Dunford had stressed in recent congressional testimony that with nearly 100 nations and approximately 30,000 foreign fighters in Iraq and Syria, the US military needed more cooperation from other nations’ intelligence operations.

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