What type of documentation is essential in the application packet?

The essential documentation in the application packet consists of forms required for background investigations. This is crucial because background checks help ensure that personnel meet the necessary security clearance standards and are trustworthy individuals. These forms typically include authorization for background checks, employment history, criminal history, education verification, and other pertinent details that allow for a comprehensive evaluation of the individual's suitability for the position.

While personal references, financial statements, and medical records may have their own importance in various contexts, they do not specifically fulfill the primary requirements of a personnel security application. Only the forms required for background investigations provide the necessary information to assess potential risks and ensure compliance with security protocols.