Which of the following is NOT a type of fire command?

The correct answer identifies "Relay" as the type of fire command that does not belong among the standard categories. In the context of fire commands, understanding the different types is crucial for effective communication and coordination in combat operations.

Initial fire commands are those given at the onset of an engagement, designed to inform the crew and organize the firing sequence. Subsequent commands follow the initial command and provide updates or changes as the situation evolves, confirming actions taken or needed. Supplemental commands are additional instructions that may be issued to enhance or clarify the initial commands.

In contrast, while a relay might imply transferring information or commands from one individual to another, it does not specifically categorize a type of command that directs fire. The definitions and roles of the other three types focus on the direct issuance of commands that dictate firing actions or strategies on the battlefield. Thus, the identification of Relay as not being a formal type of fire command stands correct in this context.