Dunford, chairman of the Joint Chiefs of Staff, tells the House Armed Services Committee that the U.S. has not compromised security as it deploys forces to Iraq. He says President Barack Obama has approved any requests that have reached his desk.
The Pentagon previously said several Marines were injured, including some that were evacuated for treatment. Others were able to immediately return to duty.
Marine Staff Sgt. Louis F. Cardin of Temecula, California, was killed by rocket fire at Fire Base Bell on Saturday. It is the first such base established by the U.S. since it returned forces to Iraq in 2014.