As a humorous aside, one place where this was prominently done was in the case of nuclear testing. The first nuclear test was given a secretive code name (Trinity) by the enigmatic Oppenheimer; the next test series (run by the less enigmatic military) simply used military A-B-C codenames (Able, Baker, and Charlie, though the latter was not fired). After going through a number of these more "boring" military sets, and as testing became more plentiful they started giving them more creative names. The names weren't supposed to have any correlation to the weapons being tested, but in some cases they were mnemonics—King was K for Kiloton, Mike was M for Megaton, both of which being special "superbombs" of Operation Castle; some were named after the code-names of their component parts, e.g. shot Harry tested the "Hamlet" device, shot Climax tested the "Cobra" device, etc. Anyway, later test series took their inspiration Native American tribes (either ironic or in bad taste, given the history of Native American interactions with government uranium mining, testing, development, etc.), scientists, wildflowers, insects, mountains, rivers, gods, etc.