Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.Officer Cadet is a rank held by military cadets during their training to become commissioned officers. The term Officer Trainee is used interchangeably in some countries. Some countries refer to naval officer cadets as midshipmen, although in other countries this means something slightly different. In the United Kingdom, the rank is also used by members of university cadet units who are not actually training to become officers. The Australian Defence Force follows the same usage as the British military system, using the rank of Officer Cadet for Australian Army (OCDT) and Royal Australian Air Force (OFFCDT) for personnel undergoing initial officer training.