In a mass casualty situation, patients tagged with red tags must be treated first because they have an injury that compromises airway, breathing, or circulation. Patients with a yellow tag are seriously injured but not expected to decompensate in the next several hours and can wait for treatment. Patients with green tags have minor injuries and are not the priority. Patients with black tags are unlikely to survive; resources must be diverted to those who can be saved. Care focuses on pain relief and palliation for these patients.