Force retains what had formerly been considered "army" rank (but which is similar to that used by the air forces of many other nations). For everyday work wear, in environments or occasions where the CF greens would not be appropriate, personnel were issued the Work Dress uniform. This consisted of rifle-green work trousers; a zippered rifle-green work jacket; a "lagoon green" work shirt; and beret. The jacket collar was worn open; the shirt was either worn with a tie, or with the collar open and over the jacket collar. For a brief period in the 1980s, ascots or dickeys in regimental or branch colours were worn inside the open shirt collar. Army field units normally wore combat boots with work dress, "blousing" the trousers with elastic boot bands. Many Army regiments wore regimental shoulder flashes on the work dress jacket. A notable exception was the Special Service Force (SSF), who wore a camouflage jump smock, regimental T-shirt, beret, and high-top paratrooper boots, with work dress or combat trousers as applicable. DEU were issued to the CF beginning in 1986. Members of the sea, land and air forces were issued uniforms distinctive to their service or "environment". Officers' and non-commissioned members' uniforms are identical, differing only in insignia and accoutrements. In 2017 a fourth pattern of DEU was created for the Special Operations Forces Branch. Ceremonial dress Ceremonial dress uniforms include elaborate traditional full dress or undress uniforms, that may be purchased by individuals or their units. Full dress uniforms (No. 1B ceremonial dress) are worn by the Canadian Army, RCAF pipe bands, and cadets of the Royal Military College of Canada. Undress (or patrol dress) uniforms (No. 1D ceremonial dress) are worn by the Royal Military College of Canada, reserve force combat arms regiments, Navy personnel and Air Force pipe bands. Although the distinctive elemental service dress uniforms are primarily used as duty uniforms, the uniform is also used as a ceremonial dress uniform when worn with ceremonial accoutrements and medals (No. 1 ceremonial dress). The uniform without accoutrements is referred to as No. 1A ceremonial dress. The uniforms may be worn for ceremonial occasions by all units which do not have full dress, or when full dress is not appropriate. Canadian Army The Canadian Army's universal full dress uniforms includes a scarlet tunic, midnight blue trousers with a scarlet trouser stripe. The scarlet tunic includes white pipings, and the