The term LT.'s Subordinate refers to two different ranks in the military: Ensign (ENS) and Sergeant (SGT). An Ensign is a junior officer in the United States Navy, Coast Guard, Public Health Service Commissioned Corps, and National Oceanic and Atmospheric Administration Commissioned Officer Corps. Sergeants are non-commissioned officers in the United States Army, Air Force, and Marine Corps. They are responsible for leading small groups of enlisted personnel and providing guidance and instruction. Both ENS and SGT are subordinate to a Lieutenant (LT), who is a commissioned officer in the United States Navy, Coast Guard, Public Health Service Commissioned Corps, and National Oceanic and Atmospheric Administration Commissioned Officer Corps.