What type of military directive is characterized by concise, direct formatting suited for operational instructions?

The correct answer is characterized by its concise and direct formatting, which is essential for delivering operational instructions quickly and clearly. Instructions are designed to provide specific guidance, often used to convey directives, policies, or procedures that need to be followed. This succinctness is critical in a military context where clarity and timely understanding can impact operations significantly.

While manuals typically offer comprehensive guidance on complex subjects and procedures, they often lack the immediate clarity required for operational execution. Notices, in contrast, tend to communicate important information or changes but are not structured specifically as directives. Procedures provide a detailed, step-by-step process but can be more elaborate than the straightforward transmission of commands that instructions aim for. Thus, instructions stand out as the preferred format for the effective communication of operational directives.