No, they're an independent government agency. Federal agencies that survive on non-appropriated funds aren't uncommon, for example, The Federal Reserve, Office

No, they're an independent government agency. Federal agencies that survive on non-appropriated funds aren't uncommon, for example, The Federal Reserve, Office of the Comptroller of the Currency, U.S. Mint and several DoD NAFIs (e.g. the different exchanges and various MWR programs).