Cinders you are correct Kapooka is part of 2Nd MD and 7 camp hospital was apart of 3 md back in the day both on the same base but 2 different command structures even into the 90s not sure if it is the same today.same as soldiers regimental numbers by state and military district dads was 18Xxx Queensland and mine 21xxxx NSW . Funny how we hang onto the tradition.