Which life-saving intervention may be performed in the warm zone?

Placement of a tourniquet for arterial bleed is a critical life-saving intervention that can be performed in the warm zone during an active shooter incident. The warm zone is an area where the threat has been assessed to be lower than in the hot zone, allowing for some medical intervention to take place while still maintaining a level of security.

In this context, the use of a tourniquet is vital for controlling severe bleeding, especially from arterial injuries, which can lead to rapid blood loss and potentially result in death if not addressed promptly. By applying a tourniquet, responders can stabilize the victim's condition until they can be moved to a more secure or medical care environment.

Other life-saving interventions, such as full medical examinations or the administration of narcotics, require a stable environment and often more comprehensive medical support, which may not be available in the warm zone. Furthermore, while psychological first aid is important, it does not directly address immediate physical threats or injuries that need urgent attention, thus making tourniquets the most appropriate intervention in that setting.