Foreign CBRN CM. Roles and Responsibilities. (1) Impacted Nation: Primary responsibility for responding to, managing, and mitigating the consequences of a foreign CBRN incident resides with the affected nation's government. When overwhelmed, the impacted nation is responsible for requesting foreign assistance and sharing all relevant information about the CBRN incident with international partners. (2) The Department of State: Unless directed otherwise by the President, DOS coordinates all USG support to an affected nation. After such an FCM support request by DOS is approved by SecDef, DOD commences its support to the affected nation as part of the overall USG response. (3) The US Embassy/Chief of Mission (COM): Normally, all USG support to the affected nation will be coordinated by the responsible COM and country team. (4) Geographic Combatant Commanders: Each GCC has the inherent responsibility to provide support to DOS, the lead for FCM, unless otherwise directed by the President. Each GCC develops plans for FCM within their assigned AOR and is prepared to deploy a liaison element to the vicinity of the incident site to liaise with the US embassy and to provide situational awareness to the supported CCDR. (5) Service Chiefs: When directed by SecDef, provide forces (to include forces from the Reserve Component) as part of the supported GCC's response during a CBRN incident. (6) Installation Commanders: As in the US, if a CBRN incident occurs, US commanders on foreign territory may, when requested by the impacted nation, exercise their immediate response authority; however, it is more restrictive (limited to saving lives) than within the homeland