What type of Defense Switched Network precedence call cannot be preempted?

The Flash Override precedence call is designed for critical communications that require immediate attention and cannot be interrupted by other calls, regardless of their precedence level. This means that even if a higher precedence call is made or if there are calls of equal or lower precedence, the Flash Override call will maintain its status and continue without being preempted.

Flash Override is part of a system used to prioritize communication in defense networks, ensuring that urgent operational needs are met without delay. This prioritization is crucial in military operations where timely information can make a significant difference in outcomes.

In contrast, the other precedence call types—Flash, Priority, and Intermediate—each have varying levels of priority but can be subject to preemption. For instance, Flash calls are high priority but can be outranked by a Flash Override, while Priority and Intermediate calls have even less urgency and can certainly be preempted by higher-tier calls. Thus, the unique capability of Flash Override to remain uninterrupted is what sets it apart from the other types of precedence calls.