In my graduating class of SFOC there was probably less than 10% of the officers that I would have trusted to hold my back. Of the NCO's I knew at 10th Gp I would have trusted about 80+% to walk slack for me.
She can walk slack for me any day of the week if she is willing.
I weighted all of 172# in RVN. Upper body strength doesn't count for as much as a calmness under fire and a nice touch on the trigger.
In the picture, of the two of them, who would you rather take one single cold bore shot at you at 1000 - 1500 yards? Take your pick, its your life. I trained them both.