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GREAT LAKES (March 4, 2021) - Hospital Corpsman 3rd Class Anson Nguyen, a Hospital Corpsman Trauma Training (HMTT)-Great Lakes student, prepares to perform a cricothyrotomy on a training manikin. HMTT is a detachment of Navy Medicine Operational Training Command and is an immersive, 7-week trauma program that gives hospital corpsmen who are on their first tour and have orders to an operational command or those experienced corpsmen returning to second or third operational tours, such as a Marine Corps unit or Navy ship, the chance to expand and fine-tune their trauma skills. U.S. Navy photo by Cmdr. Colleen Abuzeid (Released).