"I think that you appreciate that there are extraordinary men and women and extraordinary moments when history leaps forward on the backs of these individuals, that what can be imagined can be achieved, that you must dare to dream, but that there's no substitute for perseverance and hard work and teamwork because no one gets there alone; and that, while we commemorate the... the greatness of these events and the individuals who achieve them, we cannot forget the sacrifice of those who make these achievements and leaps possible."