is awarded by the band officer as a proficiency badge for Scottish highland dance when a student is considered capable of participating in parades. Mess dress Mess dress uniforms are traditional military evening wear purchased by individual members. Regular force officers are required to purchase mess dress within 6 months of being commissioned. Non-commissioned members and reserve force officers may purchase mess dress or wear the issued DEU (see ) uniform with a white shirt and bow tie (No. 2B dress). The Navy, Army, and Air Force each have unique patterns of mess dress. Within the Army, each personnel branch has its own pattern with authorized differences from the standard Army pattern; most armoured and infantry regiments have further differences from their standard branch patterns. Women may wear trousers or a long skirt. Service dress Each environment is assigned a distinctive "duty uniform," known as service dress, or No. 3 Dress. The service dress uniform consists of an environmental pattern jacket, long- or short-sleeved dress shirt, necktie, trousers (skirt optional for women), and black oxfords or ankle boots. Jackets, trousers, skirts, neckties, sweaters (for No. 3C), scarves, raincoats, overcoat, and parkas are in the specific environmental colours of navy blue (actually black) for the navy, rifle green for the army, air force blue for the air force, and olive green for the special operations branch; shirts are white, linden green, light blue, and tan, respectively. Navy Naval personnel are issued a "navy blue" (actually a tone of black according to Canadian Forces Dress Instructions) six-on-three double-breasted jacket and trousers, white shirt, and white peaked cap. For the summer periods Navy personnel may wear white trousers, a white web belt for the trousers, and white socks and shoes with No. 3B dress. These white items may also be worn with a privately purchased high-collared white tunic for No. 1C or 1D dress. Army Army personnel are issued new tunics and trousers similar in style to the old CF greens, but with the addition of shoulder straps. They were originally issued in heavyweight rifle green (worn with the old CF green dress shirt) for winter wear, and lighter-weight tan for summer; in the latter case, headgear, neckties, belts and badges were still rifle-green or on rifle-green backing. Only the Army retained the branch or regimental collar badges on the dress jacket, such non-traditional devices having been abandoned on Navy and Air Force