Captain Mabee attended the State University of New York, Maritime College in the fall of 2007. In January 2008 he was accepted into the Marine Corps NROTC program, completing Officer Candidate School in the summer of 2010. He graduated from SUNY Maritime College and commissioning as a Second Lieutenant in January 2012.
Second Lieutenant Mabee reported to The Basic School in June 2012 and completed TBS with Company D that December. In January of 2013, after a brief period of on the job training with 2d Battalion, 10th Marines, he reported to the Field Artillery Officer’s Basic Course; graduating June of that same year.
Following Artillery training Second Lieutenant Mabee returned to 2/10. Assigned to Battery G, he served as 1st Platoon Fire Direction Officer and later as 1st Platoon Commander. In March of 2014 First Lieutenant Mabee was selected as a Company Fire Support Officer for Battalion Landing Team, 3d Battalion, 6th Marines and the 24th Marine Expeditionary Unit. He was assigned to Company I and deployed December 2014 to the 5th and 6th Fleet area of operations.
In August 2015 First Lieutenant Mabee returned to 2/10, reassigned to Battery L. He served as the Gun Platoon Commander and Executive Officer. Lima Battery officially deactivated as scheduled in February 2016 and First Lieutenant Mabee was reassigned to Liaison, HQ Battery serving as a Fire Support Officer.
In May 2016 First Lieutenant Mabee was promoted to Captain and assumed his present duty of Inspector-Instructor Battery D, 2d Battalion, 14th Marines.