naval aviators). Summer mess dress (No. 2A) is similar except that a white jacket with rank insignia on navy blue shoulder boards (gold covered for flag officers) is worn, and either the waistcoat or cumberbund is worn. The winter standard pattern mess dress (No. 2) for the Canadian Army consists of a scarlet jacket with rank insignia worn on soft shoulder loops, scarlet-laced dark blue (almost black) trousers, white shirt with soft or wing collar and dark blue waistcoat. The details of regimental distinctions vary by regiments and are defined in detail in the Canadian Forces Dress Instructions. Miniature medals are worn on the left breast below miniatures of qualification badges earned. The summer standard pattern mess dress is similar except that a white jacket with rank insignia worn on black shoulder boards, and cummerbund, is worn. Army reserve regiments are authorized to wear mess dress that is distinctive to the regiment and which can consist of jackets of different cuts (for example high collar) and colours, rather than the standard pattern mess dress. Authorized summer dress (No. 2A), consisting of the white jacket in lieu of scarlet, varies from regiment to regiment, but typically is not authorized for NCMs below the rank of Warrant Officer. The winter mess dress of the Royal Canadian Air Force consists of a midnight blue jacket with gold rank insignia worn on the sleeve, black-laced midnight blue trousers, white shirt with soft collar, and a cummerbund in the colours of the Royal Canadian Air Force tartan. Miniature medals are worn on the left breast above miniatures of qualification badges earned. The summer mess dress (No. 2A) is similar except that a white jacket with rank insignia worn on midnight blue shoulder boards is worn, and is authorized as an optional order for RCAF officers only. No. 2B is authorized as an alternative for Regular Force officers who have not yet purchased mess uniform, and for Reserve Force officers and all NCMs as they are not required to purchase mess uniform. It applies to all three elements and consists of the standard service dress uniform appropriate to the element (rifle green for the Army, navy blue for the RCN and light blue for the RCAF), a white long-sleeved shirt (as issued to navy personnel) and a black bow tie. Undress ribbons and nametag are worn. No. 2C is a relaxed, ship-board only order of mess