From the Statement of Intent: "The content of the Field Operations Guide (FOG) is intended to provide guidance for the application of the Incident Command System (ICS) to any planned or unplanned event. Position descriptions, checklists, and diagrams are provided to facilitate that guidance. The information contained in this document is intended to enhance the user's experience, training, and knowledge in the application of the Incident Command System. All users must obtain proper ICS training at the level necessary to effectively utilize the system."
U.S. Fire Administration: http://www.usfa.fema.gov/