Based on data as of March 31, 1995, the GAO study identified a universe of 65,194 Federal employees who are to be eligible for special law enforcement retirement benefits and/or are eligible for special law enforcement pay and who were assigned to 1 of 173 occupational series. The study identified the following nine series that significantly involved investigative work: park ranger; police; general inspection, investigation, and compliance; compliance inspection and support; criminal investigating; game law enforcement; immigration inspection; customs patrol officer; and border patrol agent. Annual salary costs were obtained for these employees. An appendix describes the occupational tasks for each of the nine series. Another appendix presents a chart on the number of employees in the nine job series by agency as of March 31, 1995. A third appendix presents a chart that shows the annual adjusted basic pay of employees in the nine job series as of March 31, 1995.