Homeland Security Presidential Directive - 7 (December 2003) established the requirement to protect national critical infrastructures against acts that would diminish the responsibility of federal, state, and local government to perform essential missions to ensure the health and safety of the general public. HSPD-7 identified the Emergency Services as a national critical infrastructure sector that must be protected from all hazards. The Emergency Management and Response-Information Sharing and Analysis Center (EMR-ISAC) activities support the critical infrastructure protection and resilience of Emergency Services Sector departments and agencies nationwide. The fire service, emergency medical services, law enforcement, emergency management, and 9-1-1 Call Centers are the major components of the Emergency Services Sector. These components include search and rescue, hazardous materials (HAZMAT) teams, special weapons and tactics teams (SWAT), bomb squads, and other emergency support functions. This Job Aid is a guide to assist leaders of the Emergency Services Sector (ESS) with the process of critical infrastructure protection (CIP). The document intends only to provide a model process or template for the systematic protection of critical infrastructures. It is not a CIP training manual or a complete road map of procedures to be strictly followed. The CIP process described in this document can be easily adapted to assist the infrastructure protection objectives of any community, service, department, agency, or organization.