What is the Navy O-1 rank known as?

The O-1 rank in the Navy is known as Ensign (ENS). This designation is the first commissioned officer rank, marking the entry point for officers in the Navy following their completion of training and commissioning. As Ensigns, newly commissioned officers typically begin their careers in various roles, often aboard ships, submarines, or in aviation units, as they learn and gain experience in Navy operations and leadership.

The other ranks listed, such as Lieutenant Junior Grade (LTJG), Chief Warrant Officer Two (CWO2), and Chief Warrant Officer Three (CWO3), represent higher levels of seniority and carry different responsibilities within the Navy's rank structure. Understanding this hierarchy is essential for both naval operations and career progression.