Chief of Staff

Major General Mark Toy


Major General Mark Toy assumed duties as the Chief of Staff, United Nations Command on 10 August 2020.

Prior to coming to United Nations Command, he served as the commander of the Mississippi Valley Division (MVD), U.S. Army Corps of Engineers (USACE) from 2019 to 2020. While assigned to MVD, he served as the senior military officer in the division, headquartered in Vicksburg, Mississippi, responsible for water resources engineering solutions in a 370,000-square-mile area, extending from Canada to the Gulf of Mexico and encompassing portions of 12 states. In his role as division commander, he was dual-hatted, also serving as the President of the Mississippi River Commission, a presidentially appointed position.

From 2016-2019, he served as the commander of the Great Lakes and Ohio River Division (LRD), USACE, responsible for a 17 state area covering 335,000 square miles and infrastructure valued at over $80 billion. While assigned to LRD, he deployed to Kabul, Afghanistan in support of Operation Resolute Support. He served as the Director for the Enhanced Security Zone (ESZ) leading a task force composed of personnel from USACE and the Joint Improvised Explosive Device Defeat Organization (JIDO). Task Force ESZ’s mission was to improve the protective posture of Kabul’s “Green Zone” resulting in improved security for the international community and the Government of the Islamic Republic of Afghanistan.

Prior to LRD, he served as the commander of the South Pacific Division (SPD), USACE from 2014 to 2016. Established in 1888, the division encompassed California, Nevada, Arizona, New Mexico, Utah, and parts of Colorado, Oregon, Wyoming, Idaho, and Texas. He was responsible for managing a $4 billion military and civil works program.

Other key assignments include: chief of staff, Headquarters USACE, Washington, D.C.; commander, Los Angeles District, Los Angeles, CA; commander, 84th Engineer Battalion, Schofield Barracks, HI; chief, Engineer Branch, Officer Personnel Management Directorate, Human Resources Command, Alexandria, Virginia; aide-de-camp to Lt. Gen. Robert B. Flowers, the 50th Chief of Engineers and Commanding General, USACE, Washington D.C.; and assistant professor of Environmental Engineering, Department of Geography and Environmental Engineering, United States Military Academy, West Point, New York.

Major General Toy's awards and decorations include the Army Distinguished Service Medal (3 Awards), Legion of Merit (2 Awards), Bronze Star, Meritorious Service Medal (6 Awards), Army Commendation Medal (2 Awards), Army Achievement Medal (2 Awards), Meritorious Unit Citation, Army Superior Unit Award, Combat Action Badge, and Parachutist Badge. Toy is also a recipient of the Engineer Regiment’s Silver deFleury Medal.

Major General Toy is from Huntington Beach, California. He graduated from the United States Military Academy at West Point in 1987 with a Bachelor of Science in operations research.  He holds a Master of Business Administration from Boston University, a Master of Science in environmental engineering from the University of California at Los Angeles, and a Master of Science in national resource strategy from the Industrial College of the Armed Forces.  He is a registered professional engineer in the states of Arizona and Virginia.

Major General Toy is married to his wife May Toy, CPA, and they have two children, Brandon and Kayla who are both graduates of the University of California at Berkeley.