Colonel DeTrinis is from New Orleans, Louisiana. He received his commission in 2002 via the Platoon Leaders Course following graduation from Delta State University.
His operational assignments include Platoon Commander and Company Executive Officer, 1st Battalion, 2d Marines; Platoon Commander, 2d Reconnaissance Battalion; Team Commander and Company Executive Officer, 1st Marine Special Operations Battalion; Operations Officer, 2d Battalion, 2d Marines; and Commanding Officer, Marine Combat Training Battalion, School of Infantry - East. He deployed in support of Operation IRAQI FREEDOM, Operation ENDURING FREEDOM-Afghanistan, and SPMAGTF-CR-AF/Black Sea Rotational Force.
Other assignments include Officer in Charge, Special Operations Training Company, Marine Special Operations School; Regional Planner and Plans Officer, G-5, III Marine Expeditionary Force; Planner/Strategist, J-5, United States Indo-Pacific Command; and Director, G-35, U.S. Marine Forces Pacific/Fleet Marine Force Pacific.
He is a graduate of Expeditionary Warfare School (Non-resident), Command and Staff College CDET (with distinction), Command and Staff College (with distinction), the School of Advanced Warfighting, and the U.S. Navy War College’s Advanced Strategist Program. He holds a Master of Arts in Military Studies and a Master of Arts in Operational Studies from Marine Corps University and received the Colonel Franklin Brooke Nihart Award from Command and Staff College. He also holds a Master of Arts in Strategic Studies from the Navy War College.