Sergeant Major Dan Altieri joined the Marine Corps on August 16, 1982 on the delayed entry program. He completed Boot Camp at Parris Island, South Carolina on 23 March 1983 as a private in the United States Marine Corps. After completing the United States Marine Corps Military Police School at Lackland Air Force Base in San Antonio, Texas he reported for duty at 2D Military Police Company, 2D Marine Division, Camp Lejeune, North Carolina on the 5th of July 1983 where he served as a rifleman.

He deployed in October of 1983 as an attachment to Echo Company 2D Battalion, 8th Marines where he participated in Operation URGENT FURY, the invasion, evacuation, and liberation of the island of Grenada. Later in November of 1983, he participated in shore based combat operations with the Multi-National Peace Keeping Force in Beirut, Lebanon. He was then deployed to Cairo, Egypt in July of 1985 on Operation BRIGHT STAR with Golf Company 2D Battalion, 6th Marines. While at 2D Military Police Company he served in the following billets: Rifleman, Fire Team Leader, and Squad Leader until December, 1986 when obtained the rank of Sergeant.

He began his Marine Corps Reserve career in 1989 with 2D Military Police Company (B-), Headquarters and Service Battalion, 4th Force Service Support Group in Pittsburgh, Pennsylvania. His unit was mobilized during Operation DESERT SHIELD/DESERT STORM from December 1990 to July of 1991 and performed Operations involving the liberation of Kuwait, a joint NATO Operation in Northern Norway, and then stateside duty in Camp Lejeune, North Carolina with Brigade Service Support Group 2 (BSSG-2). While at Military Police Company (B-) he held the following billets: Training NCO, Squad Leader, Platoon Sergeant, Company Gunnery Sergeant, Company First Sergeant, and Platoon Commander.

He was promoted in 1995 to Staff Sergeant and in 1997 to Gunnery Sergeant. In May of 2001 he was promoted to First Sergeant and he then assumed the duties of Company First Sergeant for Lima Company, 3D Battalion, 25th Marines, 4th Marine Division in Columbus, Ohio. During his tour of duty, Lima Company won the 2001 Super Squad Competition for 4th Marine Division, conducted counter-terrorism training in, Israel in 2004, and completed a successful combat tour with Regimental Combat Team 2, 2D Marine Division, II Marine Expeditionary Force (Forward) in Al-Anbar Province, Iraq during Operation Iraqi Freedom 04-06 in 2005. They participated in such notable Combat Operations as Operation MATADOR, NEW MARKET and SWORD. On 25 March 2006 he was promoted to his present rank and assigned as the Sergeant Major for 3d Battalion, 25th Marines, 4th Marine Division.

As the 3rd Battalion, 25th Marine Sergeant Major, he conducted training operations in Queensland, Australia in 2007, and had a successful combat tour with 1ST Marine Headquarters Group, I Marine Expeditionary Force (Forward) in Helmand Province, Afghanistan during Operation Enduring Freedom (OEF10.0/10.1) in 2010-2011. Since May 2011, he has been assigned as the Regimental Sergeant Major for 25th Marine Regiment, 4th Marine Division.

Sergeant Major Dan Altieri’s personal awards include the Bronze Star, Navy and Marine Corps Commendation Medal (2 gold star with combat device), Navy and Marine Corps Achievement Medal (1 gold star), and Combat Action Ribbon (1 gold star).