Sergeant Major LaMothe is a native of Groton, CT. He enlisted in the Marine Corps in April 1998, attending Recruit Training at MCRD Parris Island, graduating in July 1998. After Marine Combat Training, he reported to Red Stone Arsenal, AL for MOS training as an Ammunition Technician Specialist. He was awarded MOS 2311.
Private LaMothe reported for duty with I MEF in Camp Pendleton, California serving in the S-4 shop. During this tour Private LaMothe was promoted to Private First Class in 1998. In 1999, Private First Class reported to Ammo Company, 1st FSSG, Camp Pendleton, California. During this tour Private First Class LaMothe was promoted to Corporal and served as Ammunition Supply NCO. In April of 2002, Cpl LaMothe was honorably discharged from the Marine Corps.
In February of 2003, Cpl LaMothe was Presidentially recalled for Operation Iraqi Freedom (OIF) and reported to I MEF G-4 Ammo where he served as the I MEF Ammunition Chief (Rear Element). During this period, Cpl LaMothe voluntarily extended his duty for an additional year on IRR, was promoted to the rank of Sergeant, and deployed in support of OIF II-1 as the I MEF Ammunition Chief (Forward). While deployed, Sergeant LaMothe also served as an auxiliary member of the I MEF CG PSD Team. In December 2005, Sergeant LaMothe was honorably discharged from active IRR.
In June 2006, Sergeant LaMothe reenlisted to the active duty component and reported to Assault Amphibian School, Camp Pendleton, California where he was awarded the MOS 1833. Upon completion of MOS school, Sergeant LaMothe reported to 3rd Assault Amphibian Battalion where he served as an Assistant Section Leader for Bravo Company. In 2007, Sergeant LaMothe deployed to Iraq in support of OIF. In January 2008, Sergeant LaMothe was promoted to the rank of Staff Sergeant. Later that year, Staff Sergeant LaMothe volunteered as a 1st Marine Division combat replacement in support of Task Force 2/7 Golf Company. He lead 19 Amphibious Assault Vehicle Crewman to support as provisional riflemen and was appointed the Company Gunnery Sergeant for Golf Company 2nd Battalion 7th Marines.
Staff Sergeant LaMothe reported for his B Billet as a Combat Instructor for the School of Infantry West in August 2009. Upon completion of the school, Staff Sergeant LaMothe was awarded the MOS 0913 and was assigned to instruct the Combat Hunter Program with Advance Infantry Training Company West. During this time Staff Sergeant LaMothe was a Team Leader for one of the Combat Hunter Mobile Training Teams and earned the Marine Corps Senior Instructor Certificate.
In September 2013, Staff Sergeant LaMothe reported to Alpha Company, 2nd Assault Amphibian Bn. During that time, he served as a AAV Section Leader. In September 2104, Staff Sergeant LaMothe was honorably discharged from active duty and reported for duty as Selected Marine Reservist for 4th Assault Amphibian Battalion with Delta Company. In 2015, Staff Sergeant LaMothe was promoted to the rank of Gunnery Sergeant and served as a platoon sergeant.
In 2019 Gunnery Sergeant LaMothe was promoted to 1stSgt and reported to 6th Communication Bn in Brooklyn, NY. During that tour, he served as the Company 1stSgt for General Support Company. Following a successful tour, 1stSgt LaMothe was selected to serve as the Battery 1stSgt for 3d Battalion 14th Marine Regiment, Hotel Battery.
In February of 2025 Sergeant Major LaMothe was promoted to his current rank and serves as the Command Senior Enlisted Leader for Combat Logistics Battalion-25 in Red Bank, NJ.
Sergeant Major LaMothe awards include the Navy and Marine Corps Commendation Medal (2nd Award), Navy and Marine Corps Achievement Medal (4th Award), Selected Marine Corps Reserve Medal (4thAward), National Defense Service Medal, NATO medal, Iraq Campaign Medal (2nd Award), Armed Forces Reserve Medal, GWOT Expeditionary Medal, GWOT Service Medal, Afghanistan Campaign Medal, Good Conduct Medal (4th award), Combat Action Ribbon, and Marine Corps Combat Instructor Ribbon.