KEFLAVIK AIR BASE, Iceland (April 4, 2022) Members of Navy Cargo Handling Battalion (NCHB) 1 and Marine Wing Support Squadron (MWSS) 271 test fuel during a fixed wing refueling operation as part of exercise Northern Viking 22 (NV22) on Keflavik Air Base, Iceland, April 4, 2022. Northern Viking 22 strengthens interoperability and force readiness between U.S., Iceland and Allied nations, enabling multi-domain command and control of joint and coalition in the defense of Iceland and Sea Lines of Communication in the Greenland, Iceland, United Kingdom (GIUK) gap. (U.S. Navy photo by Mass Communication Specialist 2nd Class Nicholas Carter)