jody cadences stated during ww1 because of a man that joined the service and had a friend that its usaly told when your in that his nick name was jody and his unit was behind enimie lines so the girl after receaving his letter telling her later sent a letter back because she thought he was going to die that she was with jody and after the man got back to the states and his battlebuddys found out stated the jody cadence as a joke and from there on it progessed to the ones i even heared in boot camp and ait and there are more thenyou will ever find on line trust me and the more volger they get the funnier they are. hope this helps been out for 2 years so there could even more then when i was in and they do sing them even after training because other then making you worry of haveing a cheating whore its to give you some kinda humor so you won't go crazy.