Before entering the incident perimeter, personnel must:

Wearing appropriate personal protective equipment (PPE) is essential prior to entering the incident perimeter for several reasons. First and foremost, the nature of firefighting and emergency response often involves hazardous conditions such as exposure to heat, toxic smoke, chemicals, or biological agents. Proper PPE provides a barrier that protects personnel from these dangers, significantly reducing the risk of injury or illness.

In addition, proper PPE is designed to ensure functionality and mobility while working in challenging environments. This includes items like helmets, gloves, fire-resistant clothing, and respiratory protection, all of which are crucial in maintaining safety and operational effectiveness during an incident.

The other options do not address the necessity of safety and preparedness required in an emergency scenario. Casual clothing lacks the protective properties needed for such scenarios, scheduled breaks are not relevant to immediate safety needs, and preparing for a long-term assignment does not negate the requirement for appropriate protective gear before engagement. Overall, the emphasis on PPE reflects the fundamental principle that safety must always be prioritized in emergency responses.