As seen through a night-vision device, Marine Corps Cpl. David Hernandez and Ella, a military working dog, provide security outside a house while his team prepares for their extraction during an urban training exercise on Guam, Jan. 13, 2016. Hernandez, a dog handler, and Ella, a specialized search dog, are assigned to Maritime Raid Force, 31st Marine Expeditionary Unit. U.S. Marine Corps Photo by Cpl. Thor J. Larson