; (2) a description of how unmanned aircraft systems were used to supplement existing inspection, data collection, or oversight activities of Department employees, including the number of operations and types of activities performed; (3) efficiency or safety improvements, if any, associated with the use of unmanned aircraft systems to supplement conventional inspection, data collection, or oversight activities; (4) the fleet of unmanned aircraft systems maintained by the Department for the program, or an overview of the services used as part of the pilot program