Which term refers to a tool that assists with detailed operational planning?

The term that refers to a tool that assists with detailed operational planning is "Annex." An annex is a supplementary document that provides additional information, instructions, or directives that are essential for the execution of a plan. In military and operational contexts, annexes enhance the clarity and depth of planning by detailing specific components of the operation, such as logistics, communication plans, or casualty evacuation procedures.

Annexes are crucial because they help to ensure that all relevant information is organized and easily accessible, aiding commanders and teams in their operational preparations. They also allow for greater specificity and nuanced planning, which can significantly affect the efficiency and effectiveness of missions.

The other options serve different purposes; for instance, a FRAGORD (Fragmentary Order) is typically a change to an existing operation plan, rather than a detailed planning tool from the start. An appendix provides supplementary material but is usually more along the lines of background information rather than a planning tool. Standard Operating Procedures (SOP) outline regular procedures and operations but do not serve the detailed planning function of an annex.