The President's Commission On the Assassination of President Kennedy-1964

http://www.history-matters.com/archive/contents/wc/contents_wr.htm

page 48- One bullet passed through the President's neck; a subsequent bullet, which was lethel, shattered the right  side of his skull.

page 50- The driver, William Greer, heard a noise which he took to be a backfire from one of the motorcycles flanking the Presidential car, When he heard the same noise again, Greer glanced over his shoulder and saw Governor Connally fall. At the sound of the second shot he realized that something was wrong, and he pressed down on the accelerator as Kellerman said, "Get out of here, fast."

 page 50-...At that point, both Governor and Mrs. Connally observed brain tissue splattered over the interior of the car. According to Governor Connally and Mrs. Connally, it was after this shot that Kellerman issued his emergency instructions and the car accelerated.

page 51- Special Agent Ready, on the right front running board of the Presidential followup car...

page 55- President Kennedy could have survived the neck injury...

         Now, just who determines whether or not a neck injury(nice word), is lethal or benign. Incredible! Search the Internet and see that many a person has died from being shot in the neck! (Perhaps the shot from behind was meant to hit the back of Kennedy's head??).

        The Zapruder film does not match up with the report that Greer only looked back once and then sped away,but that is what page 50 of the Report states! 

       After Agent Rybka was called back,by the same Emory Roberts,at Love Field(the film is on the Internet), this would have given anybody directly behind JFK to get off a clean shot, though a very quick one(less than a second!). See Zapruder frames 199-208.