Commissioned Officer Law and Legal Definition

A commissioned officer refers to a military officer holding a commission. In the U.S., a commissioned officer holds a commission and ranks as a second lieutenant or above in the U.S. Army, Air Force, or Marine Corps, or as an ensign or above in the U.S. Navy or Coast Guard. S/he derives authority directly from a sovereign power and holds a commission charging them with the duties and responsibilities of a specific office or position.