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15th Marine Expeditionary Unit
I Marine Expeditionary Force
Commanding Officer, 15th Marine Expeditionary Unit
Colonel Sean P. Dynan

Colonel Sean Dynan is a Marine Corps Infantry Officer. He graduated from the U.S. Naval Academy in 1998 and commissioned as a Marine Corps Second Lieutenant. Since commissioning, Col Dynan has had the opportunity to lead Marine platoons, companies, and an infantry battalion.  A veteran of both Iraq and Afghanistan; Col Dynan led a company in Ramadi, Iraq, during the Al Anbar awakening, 2006-2007, and was a company commander during the Marine Corps’ initial deployment to Helmand Province in 2008. In subsequent combat deployments, Col Dynan was assigned as a planner; to include assignment as the lead planner for Counter Narcotics and Counter Threat Finance in Helmand Province from 2011 to 2012 and operations officer for the 24th Marine Expeditionary Unit (MEU) during the evacuation of the U.S. Embassy in Sanaa, Yemen, in 2015. Additionally, Col Dynan has conducted three non-combat deployments to South East Asia during his career.

Prior to arriving at the 15th MEU, Col Dynan was assigned as a US Special Operations Command (USSOCOM) J5 strategic planner and lead planner for The Special Operations Forces Operating Concept 2030.  Following his joint tour at USSOCOM, Col Dynan led the Cyber Operations – Integrated Planning Element at USSOCOM, supporting USSOCOM components offensive and defensive cyber operations globally on behalf of Marine Corps Forces Cyberspace Command and United States Cyber Command.  Col Dynan assumed command of 15th MEU on July 21, 2021.

Col Dynan’s personal decorations include the Bronze Star with combat “V”, Defense Meritorious Service Medal, Meritorious Service Medal with two gold stars, Navy Commendation Medal with combat “V” and a gold star, Joint Achievement Medal, Navy Achievement Medal, Combat Action Ribbon with a gold star, and Sea Service ribbon with a silver and a gold star. He has earned Masters Degrees in Military Studies, Operational Studies, and National Security and Strategic Studies. He is a distinguished graduate of the Marine Corps Command and Staff College and graduated with highest distinction from the Naval War College.

15th Marine Expeditionary Unit