Marines with 10th Marine Regiment prepare to fire a howitzer as part of their fire support coordination exercise aboard Marine Corps Base Camp Lejeune, July 22-24, 2013. The FSCEX brought together 10th Marine Regiment and members of the Air Naval Gunfire Liaison Company to practice fire missions. - Marines with 10th Marine Regiment prepare to fire a howitzer as part of their fire support coordination exercise aboard Marine Corps Base Camp Lejeune, July 22-24, 2013. The FSCEX brought together 10th Marine Regiment and members of the Air Naval Gunfire Liaison Company to practice fire missions.