the Army switched the ACU to use the Operational Camouflage Pattern (OCP), as UCP was seen as inadequate in many environments. U.S. Department of Defense Civilian employees of the U.S. Department of Defense in combat zones began wearing the Airman Battle Uniform and Army Combat Uniform in place of the BDU (and its cousin DCU) after it was replaced. U.S. Navy From 2004 to 2007, the U.S. Navy began issuing a pixelated blue and gray "digital" pattern Navy Working Uniform (NWU) in limited quantities to some sailors on an experimental test basis. While the NWU is neither a tactical uniform nor a battle dress uniform, it is intended to take the place of many existing work ensembles (utilities, wash khaki, coveralls, M81 BDU, etc.). The disruptive pattern is primarily intended to complement U.S. Navy ship colors and to hide stains and wear, and supposedly to make the wearer a less obvious visual target for hostile forces while working aboard a naval vessel in port. To meet the Navy's cold-weather requirements, the NWU includes a fleece jacket, pullover sweater, and parka options. U.S. Navy SEALs, Seabees, and other U.S. Navy personnel deployed ashore under the cognizance of U.S. Naval Forces Central Command used "M81" woodland BDUs (referred to by the navy as CCUs) and DCUs for outdoor operations or activities in specific areas of responsibility (AOR), until the issuance of the NWU Type III in the AOR camouflage pattern. U.S. Air Force In 2004 and 2005, the U.S. Air Force experimented with but rejected a blue-toned tigerstripe uniform. In 2006, a new BDU-style uniform called the Airman Battle Uniform (ABU) was adopted, using a semi-pixelated tiger pattern with four soft earth tones consisting of tan, grey, green and blue. It failed, however, to incorporate many of the significant improvements of the ACU and MCCUU. By 2007, it was in current production. In 2008, responding to criticism that the new Airman Battle Uniform was too heavy and hot in high-temperature environments, the USAF's 648th Aeronautical Systems Squadron at Brooks City-Base revealed plans to switch to a lighter, more breathable fabric for the combat blouse section of the ABU. The original heavyweight nylon-cotton blend was changed to a lighter-weight nylon-cotton poplin material. Priority will go to those serving in the Middle East or other hot-weather theaters. On May 4, 2016, the National Commander of the Civil Air Patrol announced the USAF's approval for