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Ummmm
A tourniquet is only applied as a LAST RESORT. Once applied assume you will lose everything from the tourniquet down. Well at least one that's properly applied. Only apply when death is imminent from blood loss.
That is old school thinking and not at all accurate. TQ's should be applied immediately to help prevent bleed-out. With rapid medical attention limbs need not be lost from a TQ but more likely from damage of the wound itself, but waiting to "see how bad the bleeding is" before applying a TQ will almost surely result in massive blood loss and death assuming a solid hit.