Non-commissioned officer (Earth-2042)

A non-commissioned officer (NCO), sometimes colloquially referred to as a noncom, is a military officer that lacks a formal commission. Within the rank structure of the GRSC Armed Forces, non-commissioned officers were enlisted personnel that fill most intermediary leadership and administrative roles. The GRSC Armed Forces relied heavily on non-commissioned officers, and they shared many responsibilities with officers.

Source

 * https://www.halopedia.org/Non-commissioned_officer