The Battle Dress Uniform (BDU) is a camouflaged combat uniform that was used by the United States Armed Forces as their standard combat uniform from the early 1980s to the mid-2000s. Since then, it has been replaced or supplanted in every branch of the U.S. Armed Forces. BDU-style uniforms and derivatives still see widespread use in other countries (some of them being former U.S. surplus stocks transferred under U.S. security assistance programs), while others are still worn by some U.S. federal, state, and local law enforcement agents who may work in tactical situations, such as the DEA FAST and SWAT teams. The uniforms are also used by urban search and rescue groups such as FEMA USAR task force teams and firefighting agencies when conducting technical rescues or other special operations. As late as 2014, BDUs were worn by officers of the U.S. Public Health Service as the prescribed uniform for deployment, but have since been replaced by a variant of the U.S. Coast Guard's Operational Dress Uniform. Background While the Italian Army was the first military organization to issue camouflage clothing, albeit in limited numbers, the Germans were noted for their efforts in this field before the Second World War. After much trial, the Oberkommando der Wehrmacht (abbrev. OKW) authorized Heeres-Splittermuster 31, more commonly known as "splinter pattern", for use in shelter-quarters (Zeltbahnen) in the 1930s. In 1940, SS-Verfügungstruppe (abbrev. SS-VT; renamed Waffen-SS) designed, tested, and issued its own distinctive patterns and layout not long after. The United States Marine Corps received its first military camouflage pattern in 1942, when the reversible, beach-jungle, three- and five-color frog-skin pattern uniform was issued, based on a 1940 trial design. The pattern was mostly employed in the Pacific Theatre but was not found to be particularly effective and in the European Theatre the pattern was withdrawn altogether in 1944—in part because of anticipated friendly fire incidents after D-Day, due to its similarity to the Waffen SS's pattern (not to be confused with Flecktarn, a post-war design). Camouflaged helmet covers and shelters were issued in the 1950s in "wine leaf" and "brown cloud" patterns. The U.S. Army also tried a lesser-known camouflage uniform on D-Day and throughout the Normandy operations, like the Marine Corps uniforms, but it was replaced by the M43 uniform before being used much. During the Vietnam War, the United States Armed Forces' four-color ERDL pattern saw limited use among specialist