What guidelines must firefighters adhere to while performing their duties?

Firefighters must adhere to discipline as a crucial guideline while performing their duties. Discipline in the context of firefighting encompasses the structured and consistent behavior expected from all personnel, ensuring that they follow orders, work effectively in teams, and maintain professionalism in high-pressure situations. This adherence to discipline helps to enhance safety, efficiency, and overall operational effectiveness during emergencies.

While the other options, such as protocols, regulations, and codes of conduct, contribute to the framework within which firefighters operate, discipline is the foundational trait that governs how those guidelines are executed in practice. Discipline drives adherence to protocols and regulations, ensuring that all firefighters act in alignment with the established codes of conduct, leading to successful outcomes in emergency responses.