The ICS organizational level having responsibility for a major functional area of incident management (e.g., Operations, Planning, Logistics, and Finance/Administration).

A VHF/AM aircraft radio frequency (122.9 MHz) assigned by the FAA for use in air-to-air communications.

A colorless, odorless, nonpoisonous gas, which results from fuel combustion and is normally a part of the ambient air.

A forecast of the probability of occurrence of one or more of a mutually exclusive set of weather contingencies as distinguished from a series of categorical statements.

Process of extinguishing fire by the use of an agent that interrupts the chemical reactions in the combustion process.

A geographical area which is administratively defined and for which organized fire suppression activities are formally planned.

Any agent which retards a chemical reaction.

Aircraft that is generally used for cargo, retardant dropping, agricultural operations, survey work and other specific projects, and may not transport passengers.

A device installed in a chimney, flue, or exhaust pipe to stop the emission of sparks and burning fragments.

A fireline trench on the downhill side of fire burning on steep slopes that is supposed to be built deep enough to catch rolling firebrands that could otherwise start fire below the fireline. A high berm on the outermost downhill side of the trench helps the cup trench catch material.