Which of the following is not a type of guard?

The correct answer identifies "Forward" as not being a type of guard. In military tactics, specifically in the context of securing a position or formation, there are established types of guards that serve distinct purposes in protecting units from different angles of attack.

Flank guards protect the sides of a formation, ensuring that vulnerabilities on the lateral edges are secured. Rear guards focus on the protection of the back side of a formation, which can be crucial to prevent an enemy from outmaneuvering or flanking retreating troops. Advanced guards are usually stationed ahead of the main body to detect and engage enemy forces early, allowing for better preparation and response.

The "Forward" guard, however, is not commonly recognized in tactical terminology as a distinct type of guard in this context. The nomenclature typically focuses on flank, rear, and advanced guards as the primary defensive positions. Understanding these concepts is crucial for effective planning and execution of military operations.