Lieutenant General Mark T. Simerly currently serves as the director of the Defense Logistics Agency. Prior to this role, he served as the commanding general of the U.S. Army Combined Arms Support Command, the Army Sustainment Center of Excellence, and Fort Gregg-Adams from 2021 to 2023. Throughout his career, he has held significant logistics leadership positions, including Director of Logistics for United States Forces Korea and Deputy Director of Logistics for the United Nations Command and ROK/US Combined Forces Command. He also previously served as the commanding general of the 19th Expeditionary Sustainment Command.