Final answer:
DUI stands for Driving Under the Influence according to AR 670-1.
Step-by-step explanation:
The answer to your question is 1) Driving Under the Influence.
In the context of AR 670-1, which is a regulation in the U.S. Army that covers the wear and appearance of military uniforms, DUI refers to Driving Under the Influence. This term is used to describe the act of operating a vehicle while under the influence of alcohol or drugs.
It is important to note that DUI can have serious consequences in both the military and civilian world, as it poses a significant risk to public safety.