Which is a key aspect of employing physical security in the DoD?

The key aspect of employing physical security in the Department of Defense (DoD) is to deter unauthorized access to personnel and facilities. This principle is fundamental because one of the primary objectives of physical security measures is to protect sensitive information, assets, and infrastructure from threats such as espionage, sabotage, and other forms of interference.

Implementing robust deterrents, such as security personnel, access control systems, surveillance measures, and physical barriers, helps create an environment where potential intruders are less likely to attempt unauthorized entry. By effectively reducing vulnerabilities, the DoD can safeguard critical operations and ensure the safety of its personnel.

The other options do not align with the overarching goals of physical security within the DoD. For instance, providing unrestricted access undermines security protocols and increases the risk of threats materializing. Similarly, minimizing costs associated with physical guards at the expense of adequate protection could result in vulnerabilities that compromise security. Prioritizing aesthetics over functionality would also be contrary to the necessity of ensuring that physical security measures are effective in protecting against potential threats.