Officer training refers to the training that most military officers must complete before acquiring an officer rank. A potential recruit becomes an officer cadet

Officer Cadet

Officer cadet is a rank held by military and merchant navy cadets during their training to become commissioned officers and merchant navy officers, respectively. The term officer trainee is used interchangeably in some countries...

, someone in training. An officer in training can either be trained in a military college like West Point, or taken from the enlisted ranks. After this training is complete, the recruit in question becomes a fully fledged officer, taking on a commanding position in his or her military branch.