Final answer:
After all patients except for the walking wounded have been tagged, the next step is to prioritize and triage the patients based on the severity of their injuries and medical needs.
Step-by-step explanation:
After all patients except for the walking wounded have been tagged, the next step is to prioritize and triage the patients. This involves categorizing them based on the severity of their injuries and medical needs. Patients who are more severely injured will receive immediate medical attention, while those with less severe injuries will be attended to afterwards.