I really don't want to get into an argument about this because this is a take your pick type thing

1---the film and the x-rays show the front of the skull blown off

2--the autopsy photos show the top of the skull blown off

3--Some of the Parkland physicians, nurses, and some of the military staff at Bethesda who have come forward strongly believe it was the back of the skull which was blown open with cerebellum oozing out. It is hard to reconcile their memories with either 1 or 2.