OJOJIHARA PROVING GROUNDS, Japan (Dec. 6, 2021) U.S. Navy Lt. Mariel Guyles, an emergency room nurse with 4th Marines, examines Japanese medical equipment during a medical exchange as part of Resolute Dragon 21 at Ojojihara Proving Grounds, Japan, Dec. 6, 2021. RD21 is the largest bilateral field training exercise between the U.S. Marine Corps and Japan Self-Defense Force (JSDF) in 2021. RD21 is designed to strengthen the defensive capabilities of the U.S.-Japan Alliance by exercising integrated command and control, targeting, combined arms, and maneuver across multiple domains. (U.S. Marine Corps photo by Sgt. Kirstin Spanu)