A
non-commissioned officer or
noncommissioned officer (
NCO, colloquially
non-com) is a military
officer who has not earned a
commission. Such is also called
sub-officer in some countries. Non-commissioned officers, in the English-speaking world, usually obtain their position of authority by promotion through the
enlisted ranks. In contrast,
commissioned officers hold higher ranks than NCOs, have more legal responsibilities, are paid more, and often have more non-military training such as a university diploma. Commissioned officers usually earn their commissions without having risen through the enlisted ranks. A “
mustang” is slang term in the United States Armed Forces, referring to a commissioned officer who began his or her career as an enlisted service member.