"the fireburst came roaring and sovereign"

Gravity's Rainbow p. 693:

... wirephoto of a giant white cock, dangling in the sky straight downward out of a white pubic bush. The letters

MB DRO
ROSHI

appear above with the logo of some occupation newspaper, a grinning glamour girl riding astraddle the cannon of a tank, steel penis with slotted serpent head, 3rd Armored treads 'n' triangle on a sweater rippling across her tits. The white image has the same coherence, the hey-lookit-me smugness, as the Cross does. It is not only a sudden white genital onset in the sky--it is also, perhaps, a Tree. . . .

See also:
Hiroshima Story and
In the Shadow of Hiroshima and Nagasaki: The Cultural Conditions of Unconditional Surrender