This is only my third post, and I certainly do not want to cause trouble or make folks mad. As a 23 year veteran of the Army, who continues to practice medicine each day, I am familiar with the extensive qualifications of special forces medics, and respect them tremendously. I spent most of my time in the combat arms aid stations. I have also seen the devastating effects of many head injuries in my 28 years of medical practice. I must say, a subarachnoid hemorrhage is a real entity, and the most severe of head injuries...one which a patient is lucky to survive. It is much worse than a subdural, which is bad enough in itself. I wish that a helmet could prevent these, but it is only a minor tool in doing so. I would agree that the most important thing is fit, and having it on your head in the first place. I do not believe there is much difference in the injury rates of flip face vs full face helmets. Having said all this, I wear a full face primarily because they are quieter.