What is the difference between commissioned and non-commissioned ranks?

In the RAF, the commissioned ranks are Pilot Officer through to Marshal of the Royal Air Force. They are generally referred to as 'officers'. In the RAF, a commissioned officer is a member of the Service who derives authority directly from a sovereign power (i.e. the Monarchy), and as such holds a commission from that power. Any officer (and all non-commissioned ranks) address a senior officer as "Sir" or "Ma'am". Non-commissioned ranks are split into three groups; airmen (Aircraftsman up to Junior Technician), non-commissioned officers (or NCOs: Corporal to Flight Sergeant) and Warrant Officers. In the British Armed Forces, NCOs are split into two categories - Junior NCOs (abbreviated to JNCOs) are Corporals while Senior NCOs (SNCOs) covers Sergeants to Flight Sergeants. NCOs are enlisted members of the RAF who have been delegated leadership or command authority by a commissioned officer. They are the junior management of the Service. Experienced NCOs are a very important part of ... more