Final answer:
A 2 inch stripe with a 1/2 inch stripe above on an officer's sleeve usually indicates a Lieutenant Junior Grade in the Navy or a First Lieutenant in other military branches. They are generally second in command of a unit and handle a combination of leadership and administrative duties.
Step-by-step explanation:
An officer rank identified by one 2 inch stripe with one 1/2 inch stripe above it on their sleeve signifies a Lieutenant Junior Grade in the United States Navy, or a First Lieutenant in other branches such as the Army, Air Force, and Marine Corps. This insignia indicates an officer who is typically second in command of a platoon or troop and has responsibilities that include leading soldiers in various operations, exercising authority delegated by a senior officer, and various administrative duties.
This rank follows an entry-level officer position and precedes the rank of a full Lieutenant (Navy) or Captain (other branches). The understanding of military ranks and insignias is a key aspect of military history and traditions, which can vary significantly among different countries and military organizations.