A scale drawing showing information about a fire scene.

The response of one attack unit to a fire or other emergency with no regard for the number of return trips to that same fire or emergency.

Application of herbicide to desiccate living vegetation prior to burning.

The smaller area within the general origin area where the fire's direction of spread was first influenced by fuel, weather, and/or topography.

A general term referring to the spatial distribution and orientation of fuel particles or pieces.

Visual aid containing pertinent information regarding fire organization, current operational period resources, previous operational period resources, and next operational period resources being prepared; placed at a convenient location in fire camp for review by fireline overhead personnel on large fires. 

A natural or improved takeoff and landing area intended for temporary or occasional helicopter use.

Any ground vehicle with personnel capable of maintenance, minor repairs, and limited fueling of dozers.

A stationary in-flight condition for helicopters when no directional flight is achieved.

The lowest value for relative humidity measured at the observation site during the preceding 24-hour period.