There are two basic structure environments in the wildland. Interface- a condition where structures abut the wildland.  Intermix- a condition where structures are scattered throughout a wildland area. A preplanned area of sufficient size and suitable location that is expected to protect fire personnel from known hazards without using fire shelters. Safety zone Safety Zone and TRA are present and construction features or defensible space make it unlikely that the structure will ignite during initial fire front contact. Not threatened Safety Zone and TRA are present and construction features, lack of defensible space, or other challenges requires firefighters to implement structure protection tactics during fire front contact. Threatened defensible Either there is no Safety Zone or TRA present and/or the structure has challenges that do not allow firefighters to safely commit to stay and protect the structure during fire front contact Threatened non-defensible Keep at least ___ gallons of water reserve in your tank 100 This tactic is most appropriate when there is no Safety Zone or TRA present and the forecasted fire spread, intensity, and the projected impact time of the fire front prohibit resources from taking preparation action to protect the structure Check and go A tactic used when a Safety Zone and TRA are not present and/or when fire spread and intensity are too dangerous to stay in the area when the fire front arrives, but there is adequate time to prepare a structure for defense ahead of the fire front. Prep and go An ideal multiple resource tactic especially in common neighborhoods where efforts may be coordinated over a wide area. A tactic used when it possible for fire resources to stay when the fire front arrives. Fire behavior MUST be such that it is safe for firefighters to remain and engage the fire Prep and defend This action is taken when there is insufficient time to safely set up ahead of the fire or the intensity of the fire would likely cause injury to personnel located in front of the fire Fire front following Resources must remain mobile during Bump and Run and must constantly identify escape routes to Safety Zones and Temporary Refuge Areas as they move with the fire front. Bump and run is a tactic utilizing control lines and large water streams from fixed water supplies in an attempt to stop fire spread. The goal is to extinguish structure fires, protect exposures, and reduce ember production. Anchor and hold is a tactic where the key element is mobility and continuous monitoring of an assigned area: Tactical patrol