Little Boy was the first atomic weapon used in war. It was detonated over Hiroshima, Japan in August 1945 with a yield of 13-18 kilotons.
The Valley of the Shadow Of... From left to right these are the: PGM-19A Jupiter, PGM-17A Thor, LGM-25C Titan II, HGM-25A TItan I, Thor Agena A, LGM-30G Minuteman III, LGM-118A Peacekeeper. All but the Thor Agena are/were nuclear armed ballistic missiles. The Minuteman III fleet still serves as an active part of the United States' nuclear deterent, sleeping in their silos awaiting armaggeddon.
Bus The Peacekeeper ICBM carried ten Avco Mk-21 re-entry vehicles on a bus as its fourth stage. Each re-entry vehicle contained a W87 300 kiloton warhead.
