The first grade of commissioned officer indicated by a gold bar on the collar of the uniform. The pay grade is O-1 and is the same in the Army and the Air Force. In the Navy and Coast Guard the rank is ensign, and is additionally indicated with a broad gold stripe topped by a gold star (or insignia of staff branch) in the Navy, or a gold shield in the Coast Guard worn on shoulder boards or jacket cuffs. Sometimes pejoratively called a “butter bar.”