As the 32nd Vice Chief of Staff in the Army, Chiarelli was responsible for the day-to-day operations of the Army and its 1.1 million active and reserve soldiers. This included the oversight of many of the Army's R&D programs, and the implementation of recommendations related to its behavioral health programs, specifically its Health Promotion, Risk Reduction and Suicide Prevention Program.
As commander of the Multi-National Corps-Iraq, Chiarelli coordinated the actions of all four military services and was responsible for the day-to-day combat operations of more than 147,000 U.S. and Coalition troops. He was also the Senior Military Assistant to the Secretary of Defense Robert Gates from March 2007 to August 2008. He retired from the Army in 2012.
In 2013, Chiarelli received the Patriot Award, the Congressional Medal of Honor Society's highest honor for his work to help soldiers and families suffering from the invisible wounds of war.
Chiarelli holds a Bachelor of Science in Political Science from Seattle University, a Master of Public Administration from the Daniel J. Evans School of Public Affairs at the University of Washington, and a Master of Arts in National Security and Strategy from Salve Regina University. He is also a graduate of the College of Naval Command and Staff, and the National War College.