3rd Civil Affairs Group

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3rd Civil Affairs Group
3rd civil affairs group.png
Active 2012-present
Country United States
Allegiance United States of America
Branch United States Marine Corps
Type Civil Affairs
Role Provide civil-military operations support to I MEF or other MAGTF in order to reduce friction between the civilian population and the MEF or other MAGTF.
Part of Marine Forces Reserve

3rd Civil Affairs Group (3rd CAG) is a civil affairs (CA) unit of the United States Marine Corps based at Naval Station Great Lakes, Illinois. The Marine Corps assigns civil affairs as a primary military specialty for enlisted and additional specialty for officers. The Marine Corps uses its own civil affairs doctrine and runs the Marine Corps Civil-Military Operations School at Marine Corps Base Quantico to train civil affairs Marines.

3rd CAG as it exists today was founded in 2012. Originally, 3rd CAG was stood up in 1985 at Chavez Ravine Naval Reserve Center, Los Angeles, California. The unit relocated to Camp Pendleton following the Northridge earthquake in January 1993.

Commanding Officer of 3rd CAG is Colonel Sean Day with Sergeant Major Brandon Neel as the 3rd CAG Sergeant Major.

3rd CAG has taken part in Operation Balikitan, Cobra Gold, Korea United, and various other global operations. The CAG is made up of 3 detachments made up of Marines from all backgrounds.


3rd CAG plans and executes civil-military operations while serving as the liaison between military forces and civil authorities, the local population and non-governmental organizations. Further, it conducts activities which enhance the relationship between the military and host nation personnel and organizations facilitated through application of civil affairs specialty skills in areas normally the responsibility of civil governments.