How are TNs typically assigned during track operations?

Track Numbers (TNs) are typically assigned sequentially, starting from the lowest available number. This method provides a clear and organized system for tracking multiple objects or targets. By assigning TNs in a sequential manner, it minimizes confusion and ensures that each track can easily be identified and referenced during operations. This orderly system enhances communication and coordination among operators, which is crucial during joint military operations where multiple units may be involved.

The other options, while they may have their own merits in different contexts, do not align with the conventional practice of TN assignment. Assigning TNs randomly could lead to unnecessary complexity, and operator priority might vary and complicate the uniformity needed in operations. Block assignment by systems may not allow for the dynamic and flexible tracking needed in most real-time operational scenarios. The sequential method remains the standard for clarity and efficiency in track management.