The Navy Rank is a system of hierarchical positions within the Navy. The lowest rank is SEAMAN, which is followed by YEOMAN, ENSIGN, and ENSIGN (ENS). Above these are Petty Officer, CAPTAIN, COMMODORE, and ADMIRAL. The YEOMAN is responsible for administrative duties such as filing, typing, and record keeping. The ENSIGN is a junior officer who is responsible for leading a team of sailors. The Petty Officer is a non-commissioned officer who is responsible for the day-to-day operations of a ship or unit. The CAPTAIN is the commanding officer of a ship or unit. The COMMODORE is a senior officer who commands a squadron of ships. The ADMIRAL is the highest rank in the Navy and is responsible for the overall command of a fleet.