
Sorry, but no one (or alien) is going to know what "A.D." means when they read this in the distant future. In fact, they will most likely not know English, what a 'foot' is nor be able to guess the meaning of 'peace.' Especially if they're from the far side of the moon.
Note one man's disenchantment: "Astronauts . . . submit to the severest bodily ordeals in order to satisfy the ritual demands for space travel to distant parts of the solar system. To a certain degree, vicarious participation in these rites by the earthbound inhabitants of the planet, made possible through film, television and radio, restores the waning sense of high adventure; and the ever present possiblity of death in a cosmic stting augments, as in motor racing, the daily dose of untrammeled gladiatorial violence faithfully provided by the mass media." Lewis Mumford in The Pentagon of Power: The Myth of the Machine, 1970.
The antiquated shuttle program has reached its final frontier and paid dearly for it. America doesn't need any more dead heroes at the moment.