Final answer:
The context provided talks about regulations for soldiers on leave and their behavior, but does not directly address the placement of Direct Unit Identification (DUI) insignias, which are generally worn on service uniforms by enlisted personnel.
Step-by-step explanation:
The Direct Unit Identification (DUI) insignia is not mentioned in the context of the provided historical information about soldiers on leave.
However, usually, enlisted personnel wear the DUI on their service uniforms. The DUI is typically worn on the traditional service cap or beret and on the shoulders, signifying their unit affiliation. The historical context provided does not directly correlate with the standard placement of DUIs.
It rather discusses the regulations around soldiers wearing uniforms while on leave, the utilization of locker clubs, and the scrutiny of behavior in establishments such as bars.