LGM-118A Peacekeeper missile system being tested at the Kwajalein Atoll in the Marshall Islands.

The lines shown are the re-entry vehicles -- one Peacekeeper can hold up to 10 nuclear warheads, each independently targeted. Were the warheads armed with a nuclear payload, each would carry with it the explosive power of twenty-five Hiroshima-sized weapons

A man-made sun rose over Bikini Atoll on March 1, 1954, the 15-megaton hydrogen blast called Bravo ranks as the largest U.S. test, a thousand times greater than the atom bomb dropped on Hiroshima in 1945.