What category of military symbol would you use to depict a friendly unit on a course of action sketch?

To depict a friendly unit on a course of action sketch, using a framed symbol is appropriate because this type of symbol is universally recognized within military symbology to represent friendly forces. A framed symbol typically includes a solid border that signifies the unit's affiliation, making it clear to anyone viewing the sketch that this unit is friendly.

Framing provides an immediate visual cue that differentiates friendly units from other types of units, which can be critical in planning and executing operations. The clear delineation helps prevent confusion in communication during missions, where understanding the positions and movements of friendly forces is essential for the success and safety of all involved.

Other symbol types, such as outlined or shaded, may represent different categories, including hostile forces or non-combat entities, thereby lacking the specific clarity offered by a framed symbol when indicating friendly units.