for research and development, $145,661,000, to remain available until September 30, 2021. Federal assistance For necessary expenses of the Domestic Nuclear Detection Office for Federal assistance through grants, contracts, cooperative agreements, and other activities, $46,019,000, to remain available until September 30, 2021. Administrative provisions (Including transfer of funds) 401. Notwithstanding any other provision of law, funds otherwise made available to U.S. Citizenship and Immigration Services may be used to acquire, operate, equip, and dispose of up to 5 vehicles, for replacement only, for areas where the Administrator of General Services does not provide vehicles for lease: Provided , That the Director of U.S. Citizenship and Immigration Services may authorize employees who are assigned to those areas to use such vehicles to travel between the employees' residences and places of employment. 402. None of the funds made available in this Act may be used by U.S. Citizenship and Immigration Services to grant an immigration benefit unless the results of background checks required by law to be completed prior to the granting of the benefit have been received by U.S. Citizenship and Immigration Services, and the results do not preclude the granting of the benefit. 403. None of the funds appropriated by this Act may be used to process or approve a competition under Office of Management and Budget Circular A–76 for services provided by employees (including employees serving on a temporary or term basis) of U.S. Citizenship and Immigration Services of the Department of Homeland Security who are known as Immigration Information Officers, Immigration Service Analysts, Contact Representatives, Investigative Assistants, or Immigration Services Officers. 404. (a) Notwithstanding section 1356(n) of title 8, United States Code, of the funds deposited into the Immigration Examinations Fee Account, up to $10,000,000 may be allocated by U.S. Citizenship and Immigration Services in fiscal year 2019 for the purpose of