the salary and expenses of the employee for the entire period of assignment using funds provided under this heading. Renovation and modernization For necessary expenses for the renovation and modernization of the Herbert C. Hoover Building, $1,000,000, to remain available until expended. Business application system modernization For carrying out the activities and requirements described in section 1077 of division A of the National Defense Authorization Act for Fiscal Year 2018, $22,000,000, to remain available until September 30, 2022. Office of inspector general For necessary expenses of the Office of Inspector General in carrying out the provisions of the Inspector General Act of 1978 (5 U.S.C. App.), $34,744,000: Provided , That notwithstanding section 6413(b) of the Middle Class Tax Relief and Job Creation Act of 2012 ( Public Law 112–96 ), $2,000,000, to remain available until expended, from the amounts provided under this heading, shall be derived from the Public Safety Trust Fund for activities associated with carrying out investigations and audits related to the First Responder Network Authority (FirstNet). General provisions—Department of commerce (including transfer of funds) 101. During the current fiscal year, applicable appropriations and funds made available to the Department of Commerce by this Act shall be available for the activities specified in the Act of October 26, 1949 ( 15 U.S.C. 1514 ), to the extent and in the manner prescribed by the Act, and, notwithstanding 31 U.S.C. 3324 , may be used for advanced payments not otherwise authorized only upon the certification of officials designated by the Secretary of Commerce that such payments are in the public interest. 102. During the current fiscal year, appropriations made available to the Department of Commerce by this Act for salaries and expenses shall be available for hire of passenger motor vehicles as authorized by 31 U.S.C. 1343 and 1344