Sgt. Derick Organo, machine gunner, 3rd Battalion, 4th Marine Regiment, 1st Marine Division, explains the firing procedures for the M240B machine gun to Marine Corps Junior Reserve Officers' Training Corps cadets from Desert Hot Springs High School, at the Indoor Simulated Marksmanship Trainer Dec. 18, 2013. After firing, the cadets ate at the Phelps Mess Hall and were then taken to the Combat Center Marine Corps exchange, furthering their opportunity to experience how Marines live on a daily basis. - Sgt. Derick Organo, machine gunner, 3rd Battalion, 4th Marine Regiment, 1st Marine Division, explains the firing procedures for the M240B machine gun to Marine Corps Junior Reserve Officers' Training Corps cadets from Desert Hot Springs High School, at the Indoor Simulated Marksmanship Trainer Dec. 18, 2013. After firing, the cadets ate at the Phelps Mess Hall and were then taken to the Combat Center Marine Corps exchange, furthering their opportunity to experience how Marines live on a daily basis.