As seen through a night-vision device, two UH-60 Black Hawk helicopters fly two Marine teams to their objective during an urban training exercise on Guam, Jan. 13, 2016. The Marines are assigned to Maritime Raid Force, 31st Marine Expeditionary Unit. The raid is one scenario during the exercise to provide high-intensity, close-quarter battle training in an urban environment. U.S. Marine Corps Photo by Cpl. Thor J. Larson