On 19 March, Staff Sergeant Louis F. Cardin ( ru ) , a field artilleryman with the Battalion Landing Team, 2nd Battalion 6th Marines , 26th Marine Expeditionary Unit , was killed by an ISIS rocket attack on Firebase Bell near Makhmur , 8 other Marines were also injured, the Marines returned fire with their artillery. The Marines from the 26th MEU first began moving into the area just 2 weeks before, deploying from the USS Kearsarge . The base will be used by the . military to support the Iraqi 15th Division when they attempt to retake Mosul and the Marines had finished setting up and testing their howitzers just 2 or 3 days before the attack. The joint taskforce overseeing the campaign against ISIS announced it was deploying additional Marines from the 26th MEU to Iraq to join the roughly 3,700 . troops already deployed there to combat ISIS. There are already more than 4,000 Marines and sailors who have been deployed to Iraq since October.