The highest requisition priority used on a mission impaired request is?

The highest requisition priority used on a mission impaired request is mission capable. This designation indicates that the requested items or services are essential for restoring or maintaining the operational capability of equipment or personnel that have been rendered ineffective.

In the context of military operations, prioritizing requisitions ensures that critical resources are allocated to units that are mission impaired, helping to enhance overall readiness and effectiveness. The designation "mission capable" signifies that the requisition is closely tied to the immediate operational needs of a mission, hence it is given the highest priority to facilitate timely support.

The other options represent different types of priority levels but do not encompass the full urgency and necessity associated with a mission impaired request as effectively as mission capable. For example, urgent requests are important but may not always carry the same priority as those that directly affect mission capability.