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I Marine Expeditionary Force
I MEF Logo
Ready. Engaged. Faithful.
Official U.S. Marine Corps Website

Mission

I MEF provides the Marine Corps a globally responsive, expeditionary, and fully scalable Marine Air-Ground Task Force (MAGTF), capable of generating, deploying, and employing ready forces and formations for crisis response, forward presence, major combat operations, and campaigns. 

 

Photo Information

Lt. Col. Seth E. Anderson (right) passes the 1st Intelligence Battalion’s organizational colors to Lt. Col. B.J. Grass (left) during a change of command ceremony at Camp Pendleton, Calif. June 21, 2017. Grass was the executive officer at the Marine Corps Intelligence schools, Va., and Anderson will attend the U.S. Army War College in Carlisle, Pa. (U.S. Marine Corps photo by Lance Cpl. A. J. Van Fredenberg)

Photo by Lance Cpl. A. J. Van Fredenberg

1st Intelligence Battalion changes command

20 Jul 2017 | I Marine Expeditionary Force

1st Intelligence Battalion welcomed a new battalion commander during a change of command ceremony at Camp Pendleton, California, June 21, 2017.

After two years of commanding the battalion, Lt. Col. Seth E. Anderson relinquished command of 1st Intelligence Battalion to Lt. Col. B.J. Grass.

The battalion conducts human and counter intelligence operations, which include data analysis, forensics and battlefield surveillance. I Marine Expeditionary Force Headquarters Group uses these assets both in garrison and while deployed on Special Purpose Marine Air Ground Task Forces and Marine Expeditionary Units.

“We are genuinely excited to have [Grass] here today to command these Marines,” said Col. Roberta Shea, commanding officer, I Marine Expeditionary Force Headquarters Group, who spoke at the ceremony. “Grass has led Marines in missions ranging from combat operations to humanitarian assistance, and we could not have asked for a better officer to lead this battalion.”

Anderson balanced the battalion’s budget of more than $2 million per year while supporting approximately 45 exercises and leading more than 600 Marines. He will move on to Carlisle, Pennsylvania, where he will attend the U.S. Army War College.

“It has been hard and challenging, but it has been fun,” Anderson said. “If the only complaints your Marines have about the battalion is they want to go to war, and they want more opportunities to lead, then you are doing something right.”

Grass has earned three master’s degrees and held billets as a platoon commander, series commander and intelligence officer throughout his 18-year career. He has also deployed to Iraq and Afghanistan and served with the 11th and 15th Marine Expeditionary Units.

Grass was most recently stationed at Marine Corps Intelligence Schools, Virginia Beach, Virginia where he served as the executive officer.

“I am honored and humbled to stand before you today as your battalion commander,” Grass said. “There is no question that this is the greatest personal honor in my professional career. Make no mistake, we will work hard and we will train hard to support the MEF and all of our deployed troops. I look forward to meeting and working with each and every one of you in the days ahead.”
Phantom Menace|1st Medical Battalion Utilizes 3D Printing
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Aug. 3, 2023 | 0:36
Phantom Menace|1st Medical Battalion Utilizes 3D Printing
1st Marine Logistics Group
Aug. 3, 2023 | 0:36
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I MEF Leaders

Lt. Gen. George W. Smith Jr.
Commanding General, I Marine Expeditionary Force

Lieutenant General Smith was commissioned through the NROTC program at the University of North Carolina at Chapel Hill in May 1985. A career infantry officer, his assignments in the operating forces include Rifle Platoon Commander and 81mm Mortar Platoon Commander in 2d Battalion, 1st Marines; Logistics Officer and Rifle Company Commander in 1st Battalion, 3d Marines; and Commanding Officer, 1st Force Reconnaissance Company, during which he deployed twice in support of Operation Iraqi Freedom.

Read Biography

Brigadier General Robert C. Fulford
Deputy Commanding General, I Marine Expeditionary Force

Brigadier General Fulford was commissioned in 1992 after graduation from the United States Naval Academy.A career infantry officer, his assignments in the Fleet Marine Force include Rifle Platoon Commander and Combined Anti-Armor Team Platoon Commander in Battalion Landing Team 1/4 including deployments with the 15th Marine Expeditionary Unit

Read Biography

Colonel Brian Rideout
Chief of Staff, I Marine Expeditionary Force

Colonel Rideout holds a baccalaureate degree in Psychology from Ohio Wesleyan University, a Master of Science in Information Technology Management from the Naval Postgraduate School, a Master of Military Studies from Marine Corps University and a Master of Arts in National Security and Strategic Studies from the Naval War College.  He is a graduate

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Sergeant Major Peter A. Siaw
Command Senior Enlisted Leader, I Marine Expeditionary Force

Sergeant Major Peter A. Siaw was born in Chicago, Illinois and began recruit training in April 1993 aboard Marine Corps Recruit Depot San Diego, California. Upon graduation, he was meritoriously promoted to the rank of Lance Corporal and continued to Marine Combat Training aboard Camp Pendleton, California, and Personnel Administration School

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CMDCM(FMF/SW/AW/IW) Charles F. Ziervogel
Command Master Chief

Master Chief Ziervogel enlisted in the Navy in August of 1989. Following Basic Training in Orlando, Florida he successfully completed the Navy Nuclear Power Training Pipeline. From October 1991 to December 1996 he served as a member of Reactor Control Division onboard USS Nebraska (SSBN 739 Gold) through New Construction and Commissioning,

Read Biography

Photo Information

Lt. Col. Seth E. Anderson (right) passes the 1st Intelligence Battalion’s organizational colors to Lt. Col. B.J. Grass (left) during a change of command ceremony at Camp Pendleton, Calif. June 21, 2017. Grass was the executive officer at the Marine Corps Intelligence schools, Va., and Anderson will attend the U.S. Army War College in Carlisle, Pa. (U.S. Marine Corps photo by Lance Cpl. A. J. Van Fredenberg)

Photo by Lance Cpl. A. J. Van Fredenberg

1st Intelligence Battalion changes command

20 Jul 2017 | I Marine Expeditionary Force

1st Intelligence Battalion welcomed a new battalion commander during a change of command ceremony at Camp Pendleton, California, June 21, 2017.

After two years of commanding the battalion, Lt. Col. Seth E. Anderson relinquished command of 1st Intelligence Battalion to Lt. Col. B.J. Grass.

The battalion conducts human and counter intelligence operations, which include data analysis, forensics and battlefield surveillance. I Marine Expeditionary Force Headquarters Group uses these assets both in garrison and while deployed on Special Purpose Marine Air Ground Task Forces and Marine Expeditionary Units.

“We are genuinely excited to have [Grass] here today to command these Marines,” said Col. Roberta Shea, commanding officer, I Marine Expeditionary Force Headquarters Group, who spoke at the ceremony. “Grass has led Marines in missions ranging from combat operations to humanitarian assistance, and we could not have asked for a better officer to lead this battalion.”

Anderson balanced the battalion’s budget of more than $2 million per year while supporting approximately 45 exercises and leading more than 600 Marines. He will move on to Carlisle, Pennsylvania, where he will attend the U.S. Army War College.

“It has been hard and challenging, but it has been fun,” Anderson said. “If the only complaints your Marines have about the battalion is they want to go to war, and they want more opportunities to lead, then you are doing something right.”

Grass has earned three master’s degrees and held billets as a platoon commander, series commander and intelligence officer throughout his 18-year career. He has also deployed to Iraq and Afghanistan and served with the 11th and 15th Marine Expeditionary Units.

Grass was most recently stationed at Marine Corps Intelligence Schools, Virginia Beach, Virginia where he served as the executive officer.

“I am honored and humbled to stand before you today as your battalion commander,” Grass said. “There is no question that this is the greatest personal honor in my professional career. Make no mistake, we will work hard and we will train hard to support the MEF and all of our deployed troops. I look forward to meeting and working with each and every one of you in the days ahead.”

 
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I Marine Expeditionary Force