Which document is typically used to assign responsibilities within a specific unit?

The correct answer is Operating Instructions (OI). Operating Instructions are specialized documents that provide detailed guidance on the way specific tasks and responsibilities are to be carried out within a unit. They help clarify roles and responsibilities among personnel, ensuring that everyone understands their specific duties as related to the unit's operations. By detailing procedures and responsibilities, Operating Instructions play a vital role in maintaining operational readiness and effective functioning within the unit.

Other types of documents serve different purposes. While Air Force Instructions (AFI) provide policy and guidance at a broader level, Directive Publications set forth mandatory requirements that must be followed. Air Force Supplements (AFS) can add additional guidance or modify AFIs to fit specific needs of a base or unit, but they do not specifically assign responsibilities in the same way that Operating Instructions do.