He really ought to remember. . . . The airburst, if it happens, will be in visual range. Abstractions, math, models are fine, but when you're down to it and everybody's hollering for a fix, this is what you do: you go and sit exactly on the target with indifferent shallow trenches for shelter, and you watch it in the silent fire-bloom of its last few seconds, and see what you will see. Chances are astronomically against a perfect hit, of course, that is why one is safest at the center of the target area. Rockets are supposed to be like artillery shells, they disperse about the aiming point in a giant ellipse--the Ellipse of Uncertainty. But