The c-a-t tourniquet is a compact, lightweight tourniquet that can be self-applied using just one hand. It's windlass system provides true circumferential pressure to an extremity to occlude blood flow in the event of a traumatic wound with a significant hemorrhage. The cat has become the tourniquet of choice for many operational groups and is highly recommended by trauma medics. It was proven to be 100% effective by the US Army institute of surgical research and was noted in the February 2008 edition of the journal of trauma as the best prehospital tourniquet. It has been issued to more than one million military personnel and has nsn 6515-01-521-7976..