What publications are usually written at a lower organizational level, such as the squadron and flight level?

Operating instructions (OI) are typically written at a lower organizational level, such as that of a squadron or flight. This is because OIs provide specific guidance and procedures tailored to the unique operations and requirements of a particular unit. They are designed to address day-to-day operational procedures and standards that must be followed by personnel within that specific organizational structure.

In contrast, other types of publications like Air Force manuals, policy directives, and doctrine documents tend to be broader in scope. Air Force manuals (AFMAN) often provide guidance applicable at various levels but may not be detailed enough for the specific operations of a squadron or flight. Air Force policy directives (AFPD) set overarching policies that are applicable at a higher command level, providing strategic direction rather than operational specifics. Air Force doctrine documents (AFDD) outline fundamental principles and beliefs to guide the military and are more conceptual in nature, targeting the entire Air Force or larger commands rather than individual units.

Thus, the nature and purpose of operating instructions make them the correct choice for publications specifically written for lower levels of organization, catering directly to the operational needs of squadrons and flights.