When searching for PII (personally identifiable information) in a set of documents to be produced, it may be a good idea to run a search tailored to find Standard Form 86. This form is used to collect background information on employees considered for positions which concern national security. Government contractors and members of the armed forces may be asked to complete this form as well. The form will include information about an individual's past employers and residences. An example of the form can be found here.
Applicants have to enter their social security number at the bottom of each page of the form.
The form may include information about a person's psychological well being; travel outside the United States; and criminal history.
The United Office of Personnel Management maintains a website, e-QIP (electronic questionnaire for investigations processing) to facilitate the collection of information for SF-86.