Another reason my EDC belt is a life support/CQC rescue use. You can make it very tight and stop bleeding.
This may be a bit overkill, but I carry two CATII tourniquets, some guaze, and compression bandages in my truck. I'd be pretty upset with myself if I was in a situation where I had oppurtunity but not the tools too help either myself or someone else. I was also doing tree work for a while, where a tourniquet may be a bit more neccesary than everyday life.