In this video starting at around the 57 minute mark, Jim Jenkins says if Oswald fired at President Kennedy, he would have only fired a non-fatal back wound. He then points out the neck wound and head wound both came from the front. He shows where he thinks they came from in Dealey Plaza because he is standing in Dealey Plaza!
Remember, any time you see an autopsy picture of the back of the president's head, it is fake!