shore correctional facilities are required to wear a special uniform, instead of their regular working uniform. All prisoners, regardless of their military branch wear the same uniform, with a dark blue variant for pre-trial confinement and a khaki one for post-trial confinement. Obsolete uniforms NWU Type I Introduced in 2008, the Navy Working Uniform in blue and gray pixelated camouflage was only in service until 2019, having already been banned from shipboard use when it was found not to be flame-retardant. It had been subject to mockery both inside and outside the Navy, as "Aquaflage" and "Battle Dress Oceanic," and pointed questions about the utility of camouflage for ships' crews. The tan and green Type II and III remain in service, for Navy personnel ashore. Aviation Working Khaki Navy Uniform Regulations Change No. 11 issued 22 June 1917 authorized naval aviators to wear a summer service flying uniform of Marine Corps khaki of the same pattern as the officers' service dress white uniform tunic and trousers. It was to be worn with high, laced tan leather shoes only "when on immediate and active duty with aircraft", and might be worn under similarly colored moleskin or khaki canvas coveralls as a "working dress" uniform. Naval aviators typically flew patrol bombers from shore bases until the first United States aircraft carrier was commissioned on 20 March 1922. Differing uniforms afloat precipitated a 13 October 1922 Bureau of Navigation letter: "Uniforms for aviation will be the same as for other naval officers, doing away with the green and khaki, which may be worn until June 1, 1923, but only at air stations." Khaki aviation uniforms of a somewhat different pattern were reinstated on 8 April 1925. Service Dress Khaki During World War II, a single-breasted heavy cotton twill jacket with shoulder boards was worn with cotton twill trousers over a long-sleeved cotton shirt with a black necktie as "Service Dress Khaki", allowing cleaning in shipboard laundry facilities. Later on, through the Vietnam War, the trousers and jacket were often made of light wool or wool-blend fabric as routine access to dry-cleaning facilities became available. The uniform was dropped in 1975 by then-Chief of Naval Operations, Admiral James Holloway, in order to reduce the number of items in the officer's seabag. A revived version of the uniform was announced in 2006 on a test basis. In 2008 it was authorized for wear by commissioned