Which of the following is NOT a Fire Support function?

The option indicating "Support Troop Movement" is correct in that it is not specifically categorized as a Fire Support function. Fire Support primarily focuses on the coordination and execution of firepower to achieve desired effects on the battlefield, with functions such as synchronizing and converging fire support across all domains, supporting forces that are in contact with the enemy, and sustaining and protecting the fire support system.

While troop movement is a critical component of battlefield operations, it does not constitute a direct fire support function. Fire support is largely concerned with the planning and application of indirect fire resources to influence the enemy's ability to act, rather than the logistical and tactical considerations involved in moving troops. Thus, "Support Troop Movement" stands apart from the other choices, which are integral to effective fire support operations.