People who are smarter than me: what kind of nukes were Fat Man/Little Boy? I'm talking warhead/delivery system designations. Really bugs me that I write about GBSD/LRSO/B61 but don't know what the ones we actually used were called. @KingstonAReif etc?
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Their original development names at the time were really just "Little Boy" (abbreviated LB) and "Fat Man" (FM). They didn't come up with the "Mark" system until later, when they started mass-producing Fat Man bombs in the postwar (and calling them "Fat Men" sounds silly).
They tended to call the "Fat Man" design the Mark III, but were frequently inconsistent about it for many years. They were VERY inconsistent in how they labeled earlier bombs as Mark I or Mark II, and tended to call the Little Boy bombs "Little Boy" designs even into the postwar.