In the context of this report, NIPP stands for National Infrastructure Protection Plan. From the Executive Summary: "The Emergency Services Sector (ESS) includes a diverse array of disciplines and capabilities that enables a wide range of prevention, preparedness, response, and recovery services to serve and protect the Nation's critical infrastructure as well as the American public. As its operations provide the first line of defense for nearly all critical infrastructure sectors, a failure or disruption in the ESS could result in significant harm or loss of life, major public health issues, long term economic loss, and cascading disruptions to other critical infrastructure. […] The majority of ESS operations are organized, staffed, and managed at the State, local, tribal, and territorial (SLTT) level and are therefore highly geographically distributed. The sector's personnel-encompassing law enforcement, fire and rescue services, emergency medical services, emergency management, and public works disciplines-are its most critical assets. With the mission to prepare for and respond to a wide variety of emergencies, the ESS is vulnerable to the same risks those emergencies present to other critical infrastructure. The sector's diversity in organization, mission, and assets makes disabling the entire emergency services system difficult. However, damage or disruption to ESS components can dramatically impede the protection of the public, other critical infrastructure sectors, and disciplines internal to the sector. Given the critical mission of the ESS, risks to its operations and functions could prove disastrous to the safety and morale of the public, the protection of other critical infrastructure sectors, and the safety of its own disciplines. Significant risks to the sector derive from cyberattacks or disruptions; natural disasters and extreme weather; violent extremist and terrorist attacks; and chemical, biological, radiological, and nuclear incidents."
Department of Homeland Security: https://www.dhs.gov/