What is the command given to close the interval while marching?

The command "CLOSE, MARCH" is the correct command used to instruct troops to close the interval while marching. This command is essential in military drill and ceremonies, as it directs the personnel to reduce the distance between each individual or rank while maintaining proper formation and alignment. The term "close" indicates the action of decreasing the space between individuals, which is important for maintaining a cohesive unit appearance during movement.

In drill, commands must be clear and standardized to ensure all personnel understand and execute them uniformly. "CLOSE, MARCH" reflects the established terminology used within military contexts, making it easy to recognize and carry out in formations.

Other provided options do not align with military drill commands. Commands like "FINALIZE, MARCH" or "DECREASE, MARCH" are not standard terminology in the military, which can lead to confusion or incorrect execution. Thus, the clarity and acceptance of "CLOSE, MARCH" within military structure make it the appropriate command for this maneuver.