An enliste rank in the Military of the United States is any rank below a commissioned officer. The term can also be inclusive of noncommissioned officers. In most cases, enlisted service personnel perform jobs specific to their own occupational specialty, as opposed to the more general command responsibilities of commissioned officers. In the United States Air Force, this job specialty is known as an Air Force Specialty Code, in the United States Army and United States Marine Corps, a Military Occupational Specialty, and in the United States Navy and United States Coast Guard, a naval rating.