Overview

Lieutenant (junior grade), commonly abbreviated as LTJG (historically written Lt. (j.g.)), is a junior commissioned officer rank used by the United States Navy, the United States Coast Guard, the United States Public Health Service Commissioned Corps, the National Oceanic and Atmospheric Administration Commissioned Officer Corps, and the United States Maritime Service. It is associated with the Department of Defense pay grade O-2 and sits above the rank of ensign and below lieutenant.

Rank, insignia and forms of address

The appearance of rank insignia for a lieutenant (junior grade) varies by uniform and service branch. Insignia are typically displayed on shoulder boards, collar devices, or sleeve stripes depending on the dress. The rank is most commonly referred to aloud as "lieutenant junior grade" or simply "lieutenant," and may be abbreviated in writing as LTJG. Formal historic notation sometimes used is Lt. (j.g.).

Duties and typical assignments

Officers at this grade serve as junior, but commissioned, leaders. Typical responsibilities include acting as division officers aboard ships or at shore stations, serving as junior officers in aviation squadrons, submarine and surface warfare billets, or performing staff and technical roles in specialist corps. In the public health, NOAA, and maritime services, LTJGs carry comparable supervisory and technical duties appropriate to those organizations.

Career progression and equivalents

Lieutenant (junior grade) is normally the second commissioned officer rank after ensign. Promotion to LTJG commonly occurs after an initial period of service and satisfactory performance, and further advancement to the next rank (lieutenant, O-3) follows additional service, training, and selection. The approximate timing varies by service, community, and individual record. The rank is equivalent in pay grade to first lieutenant in the U.S. Army, Marine Corps, Air Force, and Space Force.

History and notable distinctions

The LTJG grade developed as naval organizations refined officer roles to distinguish more junior commissioned officers from more senior lieutenants. While the basic duties are broadly similar across the naval services, details of insignia, formal customs, and career timing differ between the Navy, the Coast Guard, and the uniformed non-military services such as the Public Health Service and NOAA Corps. For authoritative details on insignia and career progression in the U.S. Navy and Coast Guard, see official service resources: U.S. Navy information and U.S. Coast Guard information.

Examples of roles by environment

  • At sea: division officer responsible for a compartment or a small team, navigation, or weapons systems support.
  • Aviation: junior officer in flight squadrons involved in operations, maintenance coordination, or mission planning.
  • Shore and staff: technical specialist, training officer, or administrative leader in shore installations or headquarters.
  • Public health / NOAA: program manager, scientific officer, or operational leader in mission-specific assignments.

Although a relatively junior rank, the lieutenant (junior grade) carries significant leadership responsibility and is a common first step into positions of independent authority in U.S. naval and uniformed services.