Colonel William C. Bentley III graduated from The Citadel in May 1991 and commissioned through the Platoon Leaders Class. Over the next 9 years, he completed The Basic School and Naval Flight training, qualifying as a CH-53E helicopter pilot. Assigned to Marine Heavy Helicopter Squadron 464, he deployed aboard ship to the Norway, Mediterranean, and Arabian Gulf. In 1998, he completed the Weapons and Tactics Instructor course and was nominated as the 2d Marine Air Wing Marine Corps Aviator of the Year in 2000.
In July 2000, Col Bentley reported to Naval Air Systems Command to the Naval Mission Planning Office, PMA-233 and worked mission planning requirements for all Marine Corps aviation platforms for 3 years.
In 2003, he returned to the Marine Heavy Helicopter Squadron 464, serving as the Aircraft Maintenance Officer and Executive Officer. In 2005, he deployed as officer in charge for the CH-53E detachment to Djibouti under Combined Joint Task Force-Horn of Africa.
In August 2006, he moved to Marine Air Group 29 Headquarters as the Headquarters Squadron/Personnel Support Detachment Officer in Charge, and deployed to Iraq.
In November 2007, he assumed command of Marine Heavy Helicopter Squadron 464 supporting multiple detachments including Marine Expeditionary Unit and Horn of Africa rotations, and simultaneous squadron deployment to South America conducting disaster relief operations in Haiti. For its accomplishments, the squadron received the Chief of Naval Operations Safety Award and Marine Corps Aviation Association's Heavy Lift Squadron of the Year.
In 2009, he reported to the National War College, graduating in June 2010 with a Master's degree in National Security Strategy. In 2010, he moved to US European Command where he served in the J33 Operations Directorate as Maritime Officer, Current Actions Branch Chief, Deputy JOC Chief, and Combined Coordination Center Team Chief.
In July 2013, he moved to 2d Marine Expeditionary Brigade. Over the next four years, he served as the G-3, stood up an advisor team, and served as the Chief of Staff, executing 7 major exercises and participating in two crisis response operations.
In 2017, Colonel Bentley moved to the Office of Naval Research and served as the Military Deputy for Expeditionary Maneuver Warfare Branch.
On 13 July 2018, he assumed command of Marine Corps Installations National Capital Region-Marine Corps Base Quantico.
Colonel Bentley's personal decorations include the Legion of Merit, Defense Meritorious Service Medal w/ Oak leaf, Meritorious Service Medal w/ 1 Gold Star, Air Medal w/ Numeral 1, Joint Service Commendation Medal, Navy and Marine Corps Commendation Medal, Joint Service Achievement Medal, Navy and Marine Corps Achievement Medal.