Dr. DZIEMIAN. It is a measurement of the resistance of the target material or the air to the bullet. The greater the drag coefficient, the more the resistance to the bullet, the more the bullet slows down within a given time.
Mr. SPECTER. So would a bullet with yaw cause a greater or lesser hole on the surface which it strikes than a bullet without yaw?
Dr. DZIEMIAN. It would normally cause a greater hole. It usually would have more presented area, that is more the surface of the bullet would hit the skin.
Mr. SPECTER. And would a bullet with yaw decrease in velocity to a greater, lesser, or the same extent as a bullet without yaw?
Dr. DZIEMIAN. It would decrease in velocity to a greater extent.
Mr. SPECTER. Whether it passed through air or----
Dr. DZIEMIAN. Or through tissue, and the important thing in tissue is that it transfers more energy to the target than would a nonyawing bullet.
Mr. SPECTER. Dr. Dziemian, Governor Connally testified that he experienced the sensation of a striking blow on his back which he described as being similar to a hard punch received from a doubled-up fist. Do you have an opinion as to whether that sensation would necessarily occur immediately upon impact of a wound such as that received by Governor Connally, or could there be a delayed reaction in sensing that feeling?
Dr. DZIEMIAN. I don't have too much of an opinion on that. All I can say is that some people are struck by bullets and do not even know they are hit. This happens in wartime. But I don't know about that.
Mr. SPECTER. So that it is possible in some situations there is some delay in reaction?
Mr. SPECTER. Is it a highly individual matter as to the reaction of an individual on that subject?
Mr. DULLES. But take a wound like the wrist wound of Governor Connally. He couldn't get that without knowing it, could he?
Dr. DZIEMIAN. I think he said that he didn't know he had a wrist wound until much later.
Mr. SPECTER. I have no further questions of Dr. Dziemian, Commissioner Dulles.
Mr. DULLES. Doctor, would you give your full name?
Mr. DULLES. Would you raise your right hand? Do you swear that the testimony that you will give before this Commission is the truth, the whole truth, so help you God?