The second thing that occurs to me is that of all these great leaders, only one of them actually held the formal position of the head of their country. (remonline.com)
However, the initial position of the head restraint (too far from the head of an average - size male) is inadequate to provide the intended protection. (iihs.org)
The chin will not go down as far, but you'll start to get a sense of the correct position of the head. (kimroberts.co)