3-69. Support relationships can facilitate unified action when federal and state National Guard forces operate in the same area, subject to mission assignments. Following requests from FEMA or the state, a federal military installation or unit may support a National Guard force, particularly in cases where the federal installation is supporting FEMA efforts. However, because the command lines remain separate, any supporting relationship requires approval by both DOD and the affected state's adjutant general, in coordination with their respective federal and state coordinating officers.