The Emergency Management Assistance Compact (EMAC) is …

the first national disaster–relief compact since the Civil Defense and Disaster Compact of 1950 to be ratified by Congress. EMAC offers assistance during governor-declared states of emergency through a responsive, straightforward system that allows states to send personnel, equipment, and commodities to help disaster relief efforts in other states.”

EMAC is administered by the National Emergency Managers Association (NEMA)