Final answer:
A patient with a back injury would be triaged with a red tag during a mass-casualty incident.
Step-by-step explanation:
A patient who has experienced a back injury, with or without spinal cord damage, would be triaged with a red tag during a mass-casualty incident. The red tag is used to prioritize patients who require immediate medical attention but have a high chance of survival with prompt medical treatment. This category includes patients with severe but non-life-threatening injuries.