What government agency mandated the National Incident Management System?

The National Incident Management System (NIMS) was mandated by the U.S. Department of Homeland Security (DHS) through the Homeland Security Presidential Directive 5 (HSPD-5), issued in 2003. This directive aimed to enhance the nation's ability to manage emergencies and improve coordination among various levels of government and private sector organizations. NIMS provides a standardized framework for incident management across all types of emergencies.