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It's slightly above the wound (2 inch) not highest up. Also never on a joint. One tourniquet might not stop the bleed, then you need to place another one higher than the previous one.
It used to be that... it was revised a few years later. The idea being that you don't know if that limb has other trauma as well, internal bleeding and such... No point in only stopping the visible bleed if you missed another one that was higher on the limb. In combat, expending the energy to identify the little details isn't worth it when the real answer is to get the person back to medics and you need to focus on your job of shooting the enemy.
Of course this all depends on how your unit is structured anyway. I got much different training in the pathfinder unit I was in, who are a forward unit that may not have ANY medical personnel available. Our unit had embedded medics who taught us what they specifically expect from us since we would have limited resources when air-dropped in... Much different SOP. But the above is what I remember the last basic tourniquet training to be.