Col. Mario A. Washington, a native of Louisville, Kentucky, was commissioned into the Adjutant General Corps in 1999 upon his graduation from the University of Louisville as a Distinguished Military Graduate.  After completing the Adjutant General Corps Officer Basic Course, Washington served as a platoon leader and staff officer in the 510th Personnel Services Battalion, and the Southern European Task Force, Vicenza, Italy.

In 2004, after graduating from the Adjutant General Corps Officer Advanced Course, Washington took command of Charlie Company, 30th Adjutant General Reception Battalion, Fort Benning, Georgia. Upon completion of his command tour, he deployed to Afghanistan in support of Operation Enduring Freedom, serving as the Group S1 for 7th Special Forces Group.

From 2007 to 2014, Washington served at Human Resources Command, Alexandria, Virginia, as an Adjutant General Corps branch assignment officer. Following this assignment, he reported to the 101st Sustainment Brigade out of Fort Campbell, Kentucky, where he twice deployed in support of Operation Enduring Freedom, first as the Brigade S1, then as the commander of the 101st Human Resources Company. Upon completion of this tour, Washington returned to Human Resources Command, Fort Knox, Kentucky, serving as the Deputy Division Chief for the Soldier Programs and Services Division.

In July 2015, Washington took command of the Mission Support Battalion, U.S. Army Marketing and Engagement Brigade, at Fort Knox, Kentucky. In July 2017, he left Fort Knox for the National Defense University, Eisenhower School for National Security, in Washington, D.C. After completing this assignment, he reported to the Joint Staff J5, serving as the chief military secretariat.

Washington holds a Bachelor of Science in Occupational Training and Development from the University of Louisville. In 2010, he earned a Master of Science in Military Studies from the Marine Corps University, Quantico, Virginia, and he recently graduated from the Eisenhower School of National Security, earning a Master of Science in National Resource Strategy.

His military awards include the Defense Superior Service Medal, the Legion of Merit, the Bronze Star (two oak leaf clusters), the Meritorious Service Medal (three oak leaf clusters), the Army Commendation (one oak leaf cluster), the Army Achievement Medal (two oak leaf clusters), the Joint Meritorious Unit Award, the Meritorious Unit Citation, the Army Superior Unit Award, the National Defense Service Medal (two bronze service stars), the Afghanistan Campaign Medal (three bronze stars), the Global War on Terrorism Service Medal, the Army Service Ribbon, the Overseas Service Ribbon, and the NATO Medal.  Washington has earned the Combat Action Badge, and both Airborne and Air Assault badges.