What is the purpose of the two-in/two-out rule?

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Two-in/two-out is a safety rule that makes sure interior firefighters have a backup and a rapid rescue capability if conditions inside a hazardous area deteriorate. When two firefighters enter to work, two more stay outside to watch over them, maintain accountability, and be ready to assist or rescue them immediately if needed. This arrangement provides immediate safety support and a clear way to summon additional help, reducing the risk to everyone involved. It isn’t about radio procedures, water supply, or documenting crew assignments.