COMMUNICATIONS EXERCISE Marine Corps Sgt. Jonathan Ayala hands radio antenna equipment to Marine Corps Staff Sgt. Christopher M. Phibbs during a communications exercise to prepare the Marines for Exercise Iron Fist on Camp Pendleton, Calif., Jan. 6, 2014. Ayala, a cyber network operator, and Phibbs, a cyber network chief, are assigned to the 15th Marine Expeditionary Unit. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 372112-W-RKW72-830.jpg Photo Gallery