The very prestigious American Physical Society, the Canadian Association of Physicists, the Union of Concerned Scientists, the American Federation of Scientists and the Royal Society of Canada Scholars have all said missile defence is unworkable.
La très prestigieuse American Physical Society, l'Association canadienne des physiciens et des physiciennes, l'Union of Concerned Scientists, l'American Federation of Scientists et la Société royale du Canada ont tous jugé irréalisable la défense antimissile.