What is the function of the AF Form 1109?

The AF Form 1109 serves as a visitor register log, which is used to document individuals who are entering a specific area, such as a military installation. This form plays a critical role in maintaining security by tracking who is on-site, including the date and time of entry and the purpose of the visit. It is essential for accountability and helps ensure that access control measures are enforced, thus protecting sensitive areas from unauthorized access.

The other options do not accurately describe the purpose of the AF Form 1109. A transfer report is typically used to document personnel moves, a security clearance application pertains to the process of seeking authorization to access classified information, and an incident report is utilized to document security breaches or other significant events. Each of these functions serves different operational needs within the military and does not overlap with the visitor registration function of the AF Form 1109.