In the military:NCO
Only 
commissioned... [DOC] [TLE] Ranks & Insignia - Army [PAR] Aug 3, 2015 ... From private to Sergeant Major of the Army  Second Lieutenant to General, 
learn about the Army ranks for enlisted Soldiers, Officers and... [DOC] [TLE] Enlisted Insignias - Department of Defense [PAR] In the Army and Marines, this area is called a military occupational specialty; ... 
an Air Force staff sergeant, and a Marine corporal are considered NCO ranks.