Sergeant Major Jacobs joined the Marine Corps on 28 May 1996 and reported to MCRD Parris Island for recruit training. Upon completion of basic training, he reported to Camp Geiger, North Carolina for Marine Combat Training at the School of Infantry (East).

In October of 1996, Sergeant Major Jacobs reported to 3rd Battalion 8th Marine Regiment, India Company for service as a Machine Gunner in Weapons Platoon.

In May of 2000, Sergeant Major Jacobs reported to Marine Security Guard Battalion Quantico, Virginia for duties as a Watch Stander.

In April of 2004, Sergeant Major Jacobs reported to 3rd Battalion 2nd Marines and was placed in Weapons Company as a Section Leader for the 81mm Mortars Platoon.

In March 2007, Sergeant Major Jacobs reported to MCRD Parris Island for duties as a Drill Instructor.

In April of 2010, Sergeant Major Jacobs reported to 8th Marine Regiment, Headquarters Company for duties as the Company Gunnery Sergeant.

Sergeant Major Jacobs would be promoted to First Sergeant in March of 2012 and receive orders to Chemical Biological Incident Response Force in April 2012.

July 2013 at which point Sergeant Major Jacobs was assigned to Security Force Regiment, as the Company First Sergeant for Training Company located in Chesapeake, Virginia until June 2015.

Upon completion of his tour with Security Forces, Sergeant Major Jacobs would be assigned to 3d Reconnaissance Battalion, Okinawa, Japan where he served as the Company First Sergeant for Headquarters and Service Company and Bravo Company.

Sergeant Major Jacobs was then posted to School of Infantry (West), H&S Battalion as the Battalion Sergeant Major until 12 June 2020 where he would assume the duties as Battalion Sergeant Major for 3D Light Armored Reconnaissance Battalion located in Twentynine Palms, California from July 2020 to July 2022.

Sergeant Major Jacobs transferred to MAWTS-1 in July 2022, serving as Squadron Sergeant Major until his transfer to 7th Marine Regiment in August 2024.