The Pentagon's watchdog agency claims the Navy overpaid by $2.1 million on sole-source spare parts for the ScanEagle unmanned air system following an audit conducted from June 2015 through March 2016. Additionally, the Defense Department Inspector General predicts the service will overpay on the remaining value of $42.6 million for ScanEagle spare parts if Naval Air Systems Command contracting officials continue using the current negotiated spare part prices, according to the report released June 1 . "Naval Air Systems Command...