Sergeant Major Santini is a native of Long Island, New York. He enlisted in the Marine Corps in February 2003 and completed recruit training at Marine Corps Recruit Depot Parris Island, SC. Upon completion in May 2003, Private First Class Santini attended Marine Corps Combat Training, Camp Geiger, NC. After completion of MCT he obtained the Logistics/Embarkation Specialist MOS 0431.
In August 2003, Private First Class Santini reported to Headquarters Battery 12th Marine Regiment, Camp Hansen, Okinawa, Japan assigned as an Embarkation Clerk for the S-4. He supported multiple training exercises and coordinated the logistics for the artillery batteries rotating through 12th Marines under the Unit Deployment Program.
In November 2004, Lance Corporal Santini reported to MEU Service Support Group 22, Camp Lejeune, NC. In 2005 he was promoted to Corporal and deployed in support of Operation Iraqi Freedom with the 22d MEU and filled the billets of Embarkation Clerk and Detainee Handler on FOB Hit.
In 2007, he was promoted to Sergeant and assisted in transitioning MEU Service Support Group 22 to Combat Logistics Battalion 22 and deployed with the 22d MEU as the Embarkation Chief of CLB-22. After returning with the 22d MEU in 2008, Sergeant Santini had reached his end of active service and was transferred to the IRR.
In 2011, Sergeant Santini returned to service as a member of the Selected Marine Corps Reserve as a drilling reservist with Personnel Retrieval and Processing Company in Washington, DC. In 2012, he deployed in support of Operation Enduring Freedom as a Platoon Sergeant. While deployed, he was promoted to Staff Sergeant. From 2013 to 2017 Staff Sergeant Santini remained with Personnel Retrieval and Processing Company and filled the billets of Logistics Chief, Operations Chief, and Senior Enlisted Advisor.
In 2016, Staff Sergeant Santini deployed to Honduras as the Embarkation Chief for Marine Forces South Security Cooperation Team 17.1. In 2017, he was promoted to Gunnery Sergeant.
In 2018, Gunnery Sergeant Santini reported to Headquarters Marine Corps Casualty Section as a Case Manager and Watch Chief. While at HQMC Casualty Section, Gunnery Sergeant Santini made telephonic notification to the next of kin of wounded, injured, and ill Marines, as well as coordinated the Casualty Assistance Calls Officers for the notification of next of kin for fallen Marines. Gunnery Sergeant Santini completed his ADOS in 2020 and transferred to the IRR.
In January 2021, Gunnery Sergeant Santini reported to Marine Corps Advisors Company Alpha in Washington, DC to fill the billet of Logistics Advisor supporting South and Central America.
In June 2021, he was frocked to First Sergeant and reported to India Company, 3d Battalion, 23d Marines in North Little Rock, AR. In October 2024 First Sergeant Santini transferred to Fox Company 2d Battalion, 23d Marines to deploy as part of the Unit Deployment Program 25.1 to Okinawa, Japan.
In October 2025 Sergeant Major Santini was frocked to his current rank and reported to Marine Light Attack Helicopter Squadron – 773, Marine Aircraft Group 49 as the Command Senior Enlisted Leader.
Sergeant Major Santini’s personal decorations include the Navy and Marine Corps Commendation Medal with one gold star and the Navy and Marine Corps Achievement Medal with three gold stars.
Sergeant Major Santini has earned a Bachelor’s degree in Business Administration with a concentration in Management and a Master’s in Business Administration