Any national organization or activity that supports national forces which are part of the common force. NSEs are OPCON to the national authorities, they are not normally part of the force. Their mission is nation-specific support to units and common support that is retained by the nations. NSEs are asked to co-ordinate and co-operate with the commander and the Host Nation. If the operational situation allows for a reduction, greater co-operation and centralization of services among NSEs could produce significant savings.