What position should unconscious casualties who are not in shock be placed in to maintain their airway?

The recovery position is the correct choice for placing unconscious casualties who are not in shock. This position allows the airway to remain open and reduces the risk of aspiration, which can occur if the casualty vomits. By positioning them on their side, any secretions or fluids can drain out of the mouth, preventing obstruction of the airway.

In contrast, the supine position can lead to airway compromise due to the potential for the tongue to obstruct the throat, especially in an unconscious individual. The Trendelenburg position, which involves lying flat with the legs elevated, does not maintain airway patency and may also further complicate breathing. Lastly, the sitting position can be challenging for unconscious individuals and may result in airway blockages as well. Therefore, the recovery position is specifically designed to protect the airway and ensure adequate ventilation for those who are unconscious.