As of my last knowledge update in September 2021, the Battle Dress Uniform (BDU) is generally not authorized as the standard uniform for active-duty military personnel in the United States. The BDU was replaced by the Army Combat Uniform (ACU) and similar uniforms in other branches.
However, it’s important to note that military regulations can change, and there might be situations or units where BDUs are still allowed or authorized for specific purposes. For the most accurate and up-to-date information, you should check the latest uniform regulations from official U.S. military sources or the specific branch of the military in question.
If there have been changes or updates since my last knowledge update, these sources will provide the most reliable and current information on the authorization and use of specific military uniforms.