What does ACU stand for?

The abbreviation ACU stands for Army Combat Uniform. This term refers to the standard uniform used by the United States Army, which was introduced to provide soldiers with a more functional and effective military attire in combat situations. The Army Combat Uniform is designed to improve comfort, performance, and safety for soldiers in various operational environments, featuring advanced materials and a camouflaged pattern suitable for a variety of terrains.

The other options, while they contain military-related terminology, do not accurately represent what ACU stands for within a military context. "Active Combat Unit" and "Army Corps of Uniforms" are not recognized designations within the Army structure, and "Airborne Combat Uniform" might suggest a specific variant, but it does not match the established term for the general uniform worn by Army personnel.