U.S. Marine Sgt. Andy Muller aims in during a dry-fire drill at a close-quarters tactics course aboard Camp Pendleton, Calif., Sept. 25, 2014. Muller is a receiver-transmitter operator with Bravo Company, 1st Reconnaissance Battalion. These Marines are enhancing their skills before compositing with the 15th Marine Expeditionary Unit in October. - U.S. Marine Sgt. Andy Muller aims in during a dry-fire drill at a close-quarters tactics course aboard Camp Pendleton, Calif., Sept. 25, 2014. Muller is a receiver-transmitter operator with Bravo Company, 1st Reconnaissance Battalion. These Marines are enhancing their skills before compositing with the 15th Marine Expeditionary Unit in October.