In the Field
Tourniquets are the single most effective life-saving device in trauma care for bleeding from an extremity, and the most common piece of gear we see carried incorrectly. Operators who have used one in the field know two things: it has to be tight enough to stop arterial flow, and it has to go high and tight on the limb, not on the joint. The ones you see dangling off a duty belt as decoration are often the wrong make, the wrong width, or the wrong training, and none of those problems become obvious until somebody is bleeding on the pavement.
Common Mistake
Not making a tourniquet tight enough during the initial application. It should be tight enough to start to occlude blood flow before the windlass is tightened.
Technical Detail
A tourniquet works by applying circumferential pressure above a wound sufficient to collapse the artery supplying the limb. When properly placed, it stops blood loss within seconds and is the primary intervention for extremity hemorrhage in both civilian and military trauma protocols.
The Committee on Tactical Combat Casualty Care currently recognizes a short list of tourniquets as meeting the effectiveness and durability standards required for combat use. These include the Combat Application Tourniquet (CAT), the SOF Tactical Tourniquet (SOFTT-W), and the Tactical Mechanical Tourniquet (TMT). Commercial and pediatric variants exist and are appropriate for specific use cases.
Effective tourniquet placement requires correct width (minimum 1.5 inches to avoid nerve damage), high-and-tight placement on the proximal limb, enough rotation of the windlass to fully occlude the artery, and clear marking of the time of application. Tourniquets do not cause limb loss within the typical prehospital transport window. Loss of the limb is overwhelmingly caused by the underlying injury, not the tourniquet.
Most commercial off-the-shelf copies fail under field stress. Verified manufacturer purchase is critical. Counterfeit CAT tourniquets are a documented problem across both government and civilian supply chains.
