Mark D. McCormack

Mark D. McCormack (born 1966) is a career officer in the United States Army. A major general and veteran of the United States Army Reserve and Pennsylvania Army National Guard, since July 2024 he has served as deputy commander of First United States Army at Rock Island, Illinois. McCormack's service includes overseas assignments for Operation Joint Endeavor, the Iraq War, and Operation Spartan Shield. His awards and decorations include the Army Distinguished Service Medal, two awards of the Legion of Merit, the Bronze Star Medal, and six awards of the Meritorious Service Medal.

A native of Binghamton, New York, McCormack graduated from Mansfield University in 1989; while in college, he took part in the Reserve Officers' Training Corps. After receiving his commission as a second lieutenant, he served initially in the United States Army Reserve, and later transferred his military membership to the Pennsylvania Army National Guard. As he advanced through the ranks, he completed several command and staff assignments, and his commands included: 281st Personnel Detachment; Detachment 1, 281st Personnel Detachment; 281st Personnel Services Detachment, 28th Personnel Support Battalion, and 213th Regional Support Group. In May 2020, he was promoted to major general and assigned to command of the 28th Infantry Division. He completed this assignment in February 2024, and in July was assigned as deputy commander of First Army.