Junior officers are responsible for commanding small groups of enlisted personnel.
They manage teams, oversee daily operations, and ensure the welfare and discipline of their subordinates.
Since Junior officers are in the early stages of their careers they are expected to develop leadership, strategic thinking, and operational expertise through experience and formal training.
[1] The terms company officer or company-grade officer are used more in the Army, Air Force, or Marine Corps as the ranks of captain, lieutenant grades and other subaltern ranks originated from the officers in command of a company or equivalent (Cavalry troop and artillery battery).
In many armed forces, a junior officer is specifically a commissioned officer holding rank equivalent to a naval lieutenant, an army captain or a flight lieutenant or below.