color in the desert are usually 10 times larger than those in wooded areas, it was decided to alter the existing six-color DBDU pattern. This led to the development of a three-color pattern DCU, which was adopted. The BDU is made in various camouflage patterns by various manufacturers, such as in the MultiCam camouflage, which is in use today mainly by the public, public service persons, and some foreign military units. BDUs can be purchased from civilian vendors in the UCP pattern analogous to the ACU as well, but these are not authorized for wear by the U.S. Army's soldiers. U.S. Marine Corps The development of modern camouflage patterns and the rising desire of the various U.S. military branches to differentiate themselves from each other has resulted in new patterns for uniforms. The U.S. Marine Corps was the first branch to replace their BDUs. The Marine Corps Combat Utility Uniform (MCCUU) uses the computer-generated MARPAT pattern and several other enhancements. It was approved for wear in June 2001, became available for purchase in 2002, and the changeover was completed by October 1, 2004. Beyond that date, the BDU was authorized for wear until April 1, 2005, with limited exceptions for those small numbers of Marine Corps personnel who did not yet have the MCCUU. USMC Special Operations units (MARSOC) have recently issued M81 woodland-patterned uniforms to supplement MARPAT uniforms for special missions. U.S. Army In 2004, the U.S. Army unveiled the Army Combat Uniform (ACU), its successor to the BDU. From late 2005 to early 2008, the U.S. Army undertook the process of replacing the BDU with the ACU, with the BDU being formally discontinued by the Army in April 2008 (though most soldiers had been wearing the ACU for years by then). The Army Junior ROTC followed suit thereafter in 2009. The original version of the ACU used a pixelated "digital" pattern known as the Universal Camouflage Pattern (UCP). UCP is similar to MARPAT but uses more neutral, less saturated colors. The neutral colors, primarily foliage green and sand yellow, are designed to work best in the desert, woodland, and urban combat situations. The ACU in UCP was used by the army in all environments except for areas with snow, as the UCP pattern works poorly against white despite the heavy use of grey. An all-white BDU and the ECWCS are used instead for winterized warfare. Beginning in 2014,