top of the left pocket, and pin-on metal rank devices located on the collar. It also came with a set of khaki trousers, a khaki belt with a gold belt buckle, a command or "U.S. Navy" ballcap (garrison cap optional), and black or brown low quarter shoes, black or brown boots, or black leather safety shoes. It was often referred to as the "Wash Khaki" uniform, because it was a 100% cotton uniform that could be laundered but required pressing, differentiating it from the Service Khaki made of Certified Navy Twill (CNT) or a poly-wool blend that is considered acceptable for wear ashore and off base, but which requires dry-cleaning. At the beginning of January 2011, the working khakis were replaced by the Navy Working Uniform, although the Navy Junior ROTC still uses them as of 2017. Aviation Working Green A winter working green uniform for commissioned officers and Chief Petty Officers in the Naval Aviation community was authorized on 7 September 1917 in conjunction with adoption of the naval aviator wings breast insignia. The initial uniform pattern was the same as the officers' service dress white uniform tunic and trousers. Like the summer khaki uniform, it was to be worn with high, laced tan leather shoes. Like the aviation khaki uniform, the green uniform was temporarily banished during the early years of United States aircraft carrier operations from 1922 until a modified design was reauthorized in 1925. The final version, discontinued in January 2011, was somewhat similar to the Navy's revived Service Dress Khaki uniform in cut and design and bore additional similarities to the Marine Corps' Service Dress "Alpha" green uniform. It consisted of a green wool coat and green wool trousers with bronze buttons and a long-sleeve khaki shirt with black tie. Rank insignia consisted of black embroidery on sleeves in a style similar to the gold sleeve braid for officers, or rating marks and service "hash" marks for Chief Petty Officers, on Service Dress Blue uniforms. Metal rank insignia was worn concurrently on the collar points of the khaki shirt by line officers and CPOs. For staff corps officers, rank insignia was worn on the right collar point and staff corps insignia on the left collar point (typically Medical Corps for Naval Flight Surgeons, etc.) of the shirt. Warfare insignia and, if applicable, Command at Sea and/or Command Ashore insignia, were worn on the jacket and