what is a junior officer in the navy
Junior officer In the United States Armed Forces, the term junior officer is used by the Navy and the Coast Guard for officers in the ranks of ensign (O-1), lieutenant, junior grade (O-2), lieutenant (O-3), and lieutenant commander (O-4).
Captain (United States O-6) In the United States Navy, United States Coast Guard, United States Public Health Service Commissioned Corps (USPHS), and National Oceanic and Atmospheric Administration Commissioned Officer Corps (NOAA Corps), captain is the senior-most commissioned officer rank below that of flag officer (i.e., admirals). The equivalent rank is colonel in the United States Army, Air Force, and Marine Corps. The predecessors of the NOAA Corps—the United States Coast and Geodetic Survey Corps (1917–1965) and the Environmental Science Services Administration Corps (ESSA Corps) (1965–1970)—also used the rank.