What is the recommended action for controlling massive hemorrhage in a casualty?

Applying a tourniquet as quickly as possible is the recommended action for controlling massive hemorrhage in a casualty due to its effectiveness in rapidly occluding blood flow to a limb that is severely bleeding. When swift action is taken, it can significantly reduce blood loss and increase the chances of survival for the casualty. Studies and battlefield experiences have demonstrated that early tourniquet application is crucial in preventing fatalities from traumatic hemorrhagic shock, especially in combat or emergency scenarios where time is of the essence.

In contrast, using pressure bandages alone may not be sufficient for massive hemorrhage, as they can take longer to apply effectively or may not fully control the bleeding if the injury is severe. Waiting for medical personnel to arrive is not an option in life-threatening situations, as immediate action can mean the difference between life and death. Providing verbal reassurance to the casualty is important to help reduce anxiety and maintain composure, but it does not directly address the critical need to stop bleeding. Hence, applying a tourniquet represents the most critical intervention in managing massive hemorrhage.