In the Apollo era, whenever there was a significant event about to occur, the flight director (I can recall the voice of Gene Kranz) would do a sort of go/no-go "roll call". He would call off names like "fido", "gido"(?), etc. (obviously shortened from a more meaningful title), to which someone would respond with a "go" (don't ever recall hearing a "no go"). Views of the controller room showed perhaps dozens of people; the director called off maybe 7 names.
What were the short names short for (what was the full title and scope of responsibility), and how was a room full of controllers organized so that only a short call-off list properly represented an over-all "go"/"no-go" status?