Island Exercise Marine Corps Cpl. Cristina Fuentes fires a GAU-17/A gun during an exercise over Farallon De Medinilla, Northern Mariana Islands, Sept. 16, 2016. Fuentes is a crew chief assigned to Marine Medium Tiltrotor Squadron 262 (Reinforced). The Marines trained as a part of Valiant Shield 16, a biennial exercise focusing on real-world proficiency in sustaining U.S. joint forces at sea, in the air, on land and in cyberspace. Marine Corps photo by Cpl. Darien J. Bjorndal SHARE: Download: Full Size (1.97 MB) Credit: Cpl. Darien J. Bjorndal VIRIN: 160916-M-MF313-103A.JPG Photo Gallery