INDIAN OCEAN (Dec. 29, 2020) Hospitalman Kevin Nguyen, right, and Hospital Corpsman 1st Class Brian Nelson, both with Battalion Landing Team 1/4, 15th Marine Expeditionary Unit, assess a notional patient’s injuries during a mass casualty drill aboard the amphibious transport dock ship USS San Diego (LPD 22). The Makin Island Amphibious Ready Group and the 15th MEU are conducting operations in the U.S. 6th Fleet area of responsibility. (U.S. Marine Corps photo by Sgt. Desiree King)