What is meant by promotion in rank?

Promotion in rank refers to the process by which an individual in the military advances to a higher rank and associated pay grade. This advancement typically occurs based on a combination of demonstrated performance, experience, and completion of required training or education. When an officer is promoted, they gain increased responsibilities, authority, and benefits that come with the higher rank.

The concept of promotion is fundamental in military structure as it helps maintain morale and motivation within the ranks. It signifies recognition of an individual's contributions and capabilities, paving the way for further development in their military career.

In contrast, the other options focus on aspects unrelated to the promotion process. Moving to a different branch of service or changing duty assignments without a change in rank does not constitute a promotion, and while receiving additional training might be part of the requirements for promotion, it alone does not result in an increase in rank.