What is the recommended action for a casualty who is unconscious but breathing?

Placing an unconscious but breathing casualty in the recovery position is crucial for maintaining an open airway and preventing aspiration. This position helps keep the airway clear by allowing fluids or vomit to drain out of the mouth rather than entering the lungs, which can lead to serious complications such as choking or pneumonia. It also provides a safe way to monitor the casualty until further medical assistance is available.

This action demonstrates proper first aid practice by ensuring that the casualty can breathe freely while minimizing the risk of further harm. Regular monitoring can also be performed to assess any changes in their condition.

The other options, while important in different contexts, do not address the immediate priority of ensuring the casualty's airway is protected. Immediate CPR is reserved for a non-breathing casualty, administering oxygen is not necessary if the casualty is already breathing adequately, and performing abdominal thrusts is inappropriate in this scenario as it is meant for cases of choking.