Which branch of the military uses the term 'Lieutenant Commander'?

The term 'Lieutenant Commander' is a rank used exclusively within the Navy. This rank is situated between the ranks of Lieutenant and Commander and typically involves leadership of a division, department, or specific mission within naval operations. The Navy’s rank structure is unique and reflects its operational demands and organizational hierarchy, differentiating it from the ranks and titles used in the Army, Air Force, and Marines. Other branches have different titles for similar levels of responsibility but do not utilize 'Lieutenant Commander' within their ranking systems, making it specific to the Navy.