Master Gunnery Sergeant Concepcion was born on 09 March 1971, and graduated from Olney High School in Philadelphia, PA in 1990. He enlisted in the Marine Corps on 22 October 1990 and underwent Marine Corps Recruit Training at Parris Island, South Carolina. Upon graduation, he was assigned to Marine Combat Training at Camp Geiger, Camp Lejeune, North Carolina. Following graduation, he was then assigned to the Marine Corps Corrections Specialist School at Lackland Air Force Base, Texas where he attained the MOS 5831, Correction Specialist.
His first permanent assignment was with Corrections Battalion, Camp Pendleton, California. While at the Brig, he was assigned several billets including Corrections Specialist, CORMIS data clerk and the battalion commander’s driver. In 1992, he requested and received orders to attend the Marine Security Guard Battalion (MGS). Upon graduation his first post assignment was with MSG Detachment Cairo Egypt. His primary duty was a watch-stander and his collateral duties were bar NCO and supply NCO. He was promoted to Corporal 1992. His next post assignment with MSG Detachment Tokyo, Japan. His primary duty was a watch-stander and his collateral duties were mess NCO and react NCO. He was promoted to Sergeant in 1995 and returned to his primary MOS.
He received orders to Security Battalion, Camp Pendleton, CA and was assigned as a section leader for 2nd Security Platoon. After a year on security, he was sent TAD to Lackland Air Force Base to attend the Correctional Counselor Course. Upon graduation, he attained the MOS 5832 and return to the Brig at Camp Pendleton for duty as a correctional counselor.
In 1999, he was promoted to Staff Sergeant, married his current wife and received orders to Headquarters and Service Battalion, Marine Corps Base, Camp Smedley D. Butler, Okinawa Japan. His primary duties were Duty Brig Supervisor, Correctional Counselor, and Programs Chief. He was promoted to Gunnery Sergeant in 2004.
In 2006, he received orders to Headquarters and Support Battalion, Marine Corps Base, Camp Lejeune, NC Brig Company. His primary duties were Company Gunnery Sergeant, Programs Chief, and Programs Officer.
In 2008, while assigned to the brig, he deployed to Iraq with Kilo Battery, 10th Marines, 2nd MARDIV in support of Task Force MP. He was assigned as the Detention Evaluation Assessment Program SNCO.
After his deployment, he returned to the Brig at Camp Lejeune and resumed his regular duties. In 2009, he was promoted to Master Sergeant. In 2011 he was promoted to Master Gunnery Sergeant and in 2012 he received orders Headquarters Marine Corps, Law Enforcement and Corrections Branch, Plans Policies and Operation as the Operations Chief and Senior Enlisted Advisor.
In 2016, he received orders to Headquarters and Service Battalion, Marine Corps Base, Camp Smedley D. Butler, Okinawa Japan. His primary duties were Duty Brig Supervisor.
In 2018, he received orders to Lackland Air Force Base, San Antonio, TX. and assumed duties as the Senior Enlisted Advisor, Marine Corps Detachment.