Marine Corps Lance Cpl. Nathaniel Sheffield, an Assault Amphibious Vehicle mechanic conducts a check with a Japanese Ground-Self Defense Force soldier during an AAV land driving training event during Exercise Iron Fist, Marine Corps Base Camp Pendleton, Calif., Feb. 8, 2017. Sheffield is assigned to Headquarters and Support Company, 3rd Assault Amphibian Battalion. Iron Fist is an annual, bilateral training exercise where U.S. and Japanese service members train together and share techniques, tactics and procedures to improve their combined operational capabilities. Marine Corps photo by Lance Cpl. Tyler Byther