Deputy Under Secretary of the Army (DUSA)
Mr. Diaz was appointed as the 21st Deputy Under Secretary of the U.S. Army in October 2021. In that role, he is the principal civilian senior advisor to the Secretary of the Army and Under Secretary of the Army. He has management oversight of civilian senior leader assignments, the Army Test & Evaluation Executive, and other areas of policy and strategy as identified by Army senior leadership.
Mr. Diaz served as an Infantry officer for 30 years in the US Army, including combat command of both an Infantry Stryker Battalion in Iraq and an Infantry Brigade Combat Team in Afghanistan. Formative strategic assignments included Military Assistant to the Secretary of the Army and Senior Military Assistant to the Under Secretary of Defense for Policy. Mr. Diaz culminated his military career as the Assistant Division CommanderSupport for the 25th Infantry Division and then the Chief of Staff for I Corps.
Post military career, Mr. Diaz served as a Senior Mentor and Highly Qualified Expert with the US Army Mission Command Training Program. He advised commanders and staff at the Army Corps, Division, and Brigade levels during exercises and provided expert knowledge in integrating war fighting capabilities and programs. Additionally, he has served as a Special Assistant for Outreach & Mentorship to the Assistant Secretary of the Army for Manpower & Reserve Affairs. In this capacity, he was responsible for developing, leading, and managing plans and programs designed to ensure that the U.S. Army prioritizes talent acquisition commensurate with the American population.
Mr. Diaz is a graduate of the US Military Academy at West Point, the School of Advance Military Studies at Fort Leavenworth, and the National War College in Washington D.C. Mr. Diaz also has received a Master of Arts in History. He is married to Shawn Diaz, and they have three adult daughters - Marissa, Shaylin, and Olivia.
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