A Lieutenant Commander is a rank in the naval and maritime services, typically found in the United States Navy and other navies around the world. It is above the rank of Lieutenant and below Commander. Officers at this rank often have significant responsibilities, including leading divisions or departments on ships, submarines, or shore installations. Lieutenant Commanders usually have several years of experience and may serve in various roles, such as operations, administration, or training. They are often involved in decision-making processes and may command smaller vessels or units, contributing to the overall mission of their respective service branches.