Mission - Execute and enable Security Cooperation (SC) programs, training, planning, and activities in order to ensure unity of effort in support of USMC and Regional Marine Component Command (MARFOR) objectives and in coordination with the operating forces and MAGTF(s).

History -  Marine Corps Security Cooperation Group (MCSCG) is the merger of the Marine Corps Training and Advisory Group (MCTAG) and the Marine Corps Security Cooperation Education and Training Center (SCETC).  This combined command was officially established on 1 October, 2011 aboard Fort Story, VA in the former MCTAG compound.  MCSCG continues a long tradition of security cooperation that dates to the 1920s and '30s when the Marine Corps trained the Gendarmerie d'Haiti and the Guardia Nacional of Nicaragua.

Organization -  MCSCG has three unique elements beyond the conventional staff organization found in every Marine headquarters:
 

- The Regional Sections assist the regional Marine Forces headquarters in coordinating, planning, and executing SC events.  Each Regional Section is led by a Foreign Area Officer (FAO), an expert in his respective geographic are.

- The Training Branch provides SC related training to active duty and reserve Marines tailored to the region and the anticipated SC mission. Elements of the Training Branch can also deploy forward to provide Mobile Training Teams in support of regional Marine Forces Headquarters.

- The Security Assistance (SA) Branch coordinates, manages, and executes U.S. Marine Corps Security Assistance education and training programs. International student training includes formal, informal, and distance learning in the U.S. or overseas.