Army Sgt. Maj. Maureen Simpkins, the operations sergeant

Army Sgt. Maj. Maureen Simpkins, the operations sergeant major for 4th Joint Communications Squadron, Joint Communications Support Element (Airborne), U.S. Army Reserves, and Master Gunnery Sgt. Paul Olson with 4th Air Naval Gunfire Liaison Company, Force Headquarters Group, Marine Corps Forces Reserve, oversee the cooperative training of Marines and Soldiers during Exercise Lightning Strike aboard Marine Corps Base Camp Pendleton, Calif., July 29, 2015. The service members trained with various forms of communication equipment including both voice and data transmission. (U.S. Marine Corps photo by Lance Cpl. Caitlin Bevel)