The ACU series camouflage uniform (Army Combat Uniform) is the standardized combat attire adopted by the U.S. Army since 2004, renowned for its excellent concealment and functionality. Its distinctive digital camouflage pattern (UCP, Universal Camouflage Pattern) combines gray, green, and tan, designed to adapt to various environments. The ACU is made from durable, breathable fabric and features multiple practical pockets, hook-and-loop fasteners, and a modular design, making it convenient for soldiers to carry equipment. Additionally, the ACU is compatible with body armor and other tactical gear, making it an essential piece of equipment on the modern battlefield. Although the UCP pattern was later replaced by more environment-specific camouflage, the design philosophy of the ACU continues to have a profound impact on modern military uniforms.