Capt Koonce graduated Recruit Training as a meritorious PFC with Company D, 1st Recruit Training Battalion, Marine Corps Recruit Depot (MCRD) San Diego on 6 September 2002. Following Recruit Training, he attended Marine Combat Training at the School of Infantry in Camp Pendleton, California. From October to December of 2002, he attended Basic Combat Engineer School in Courthouse Bay, Camp Lejeune, North Carolina. From there, he joined 7th Engineer Support Battalion in Camp Pendleton, California and deployed in support of Operation Iraqi Freedom from January to June of 2003, participating in the initial invasion of Iraq.
In December of 2003, he attended Mountain Warfare Training in Bridgeport California. He deployed to Fallujah, Iraq from March to September of 2004, taking part in Operation Vigilant Resolve. Following his second deployment, he completed the Combat Engineer Noncommissioned Officer Core Module known as Journeyman School in Courthouse Bay, Camp Lejeune, North Carolina. From September of 2005 to March of 2006, he deployed in support of Operation Iraqi Freedom as a Squad Leader. During the latter two deployments, he also served as an engineer augment with 1st Reconnaissance Battalion.
Following a period of split time in the IRR, during which he worked his way up to an upper retail management position and attended school at Illinois State University, he was commissioned on 13 August 2011. He attended The Basic School (TBS) from August 2011 to March 2012, where he graduated with appointment to the Commanding General’s Honor Roll.
In April 2012 he attended the Military Police Basic Officer Leader Course in Fort Leonard Wood, Missouri, and graduated as the Distinguished Honor Graduate and class leadership awardee in August of 2012. Upon graduation, he was assigned to 1st Law Enforcement Battalion Camp Pendleton, California where he served in the duties of Platoon Commander and Company Executive Officer. From October 2013 to November 2014, he served as the Antiterrorism Officer and Law Enforcement Integrations Officer for 3d Marine Aircraft Wing. From June to November of 2014, he deployed to Afghanistan in support of Operation Enduring Freedom 14.2 overseeing the Antiterrorism and Force Protection duties for the Aviation Command Element of I MEF, including the closing and turning-over to Afghan Armed Forces of Camps Bastion and Leatherneck, Helmand Province.
From December of 2014 to May of 2015, he returned to 1st Law Enforcement Battalion as the Battalion Training Officer and also completed the Marine Corps Police Academy West Basic Police Officer Course at Marine Corps Air Station Miramar, earning the class a Honor Graduate award. In January of 2015, he was selected to the Fiscal Year 2015 Commandant’s Career Level Education Board. From May to December of 2015, he attended Military Police Captains Career Course in Fort Leonard Wood, Missouri, graduating at the top of his class as the Distinguished Honor Graduate, and earning the class leadership award.
Captain Koonce checked in to Echo Company, 2nd Recruit Training Battalion, MCRD Parris Island on 5 January 2016 as a Series Commander. On 9 December 2016, he assumed the duty of Company Commander, Company H, 2nd Recruit Training Battalion. On 2 March 2018, Captain Koonce relinquished command of Company H and assumed his current duties as Assistant Director, Drill Instructor School, Parris Island, South Carolina.
Captain Koonce graduated in December 2006 from Illinois State University in Normal, IL, earning a Bachelor of Science degree in Business and Organizational Leadership. In December 2015, he earned a Master of Arts degree in Business and Organizational Security Management from Webster University of St. Louis.