Which statement best defines a fragmentary order (frag-o)?

A fragmentary order, commonly referred to as a frag-o, is an abbreviated form of an operation order. This type of order is used to update or modify an existing operation plan, allowing commanders to communicate essential changes or new information without the need for a full operational order. Frag-os are essential in maintaining effective communication among units when circumstances evolve rapidly, as they provide clarity and guidance while conserving time and resources.

In contrast, a comprehensive plan for a new operation would typically require a more detailed and structured approach than is encompassed within a frag-o. Similarly, a directive issued before any orders would not fit the nature of a frag-o, which is specifically intended as an amendment to existing orders rather than a standalone directive. Lastly, a historical analysis of past operations does not relate to the operational planning process but rather focuses on lessons learned from previous actions, which is outside the scope of what a frag-o entails.