and alteration, as authorized by law, $78,446,000, to remain available until September 30, 2023. Family housing operation and maintenance, air force For expenses of family housing for the Air Force for operation and maintenance, including debt payment, leasing, minor construction, principal and interest charges, and insurance premiums, as authorized by law, $317,274,000. Family housing operation and maintenance, defense- W ide For expenses of family housing for the activities and agencies of the Department of Defense (other than the military departments) for operation and maintenance, leasing, and minor construction, as authorized by law, $58,373,000. Department of defense family housing improvement fund For the Department of Defense Family Housing Improvement Fund, $1,653,000, to remain available until expended, for family housing initiatives undertaken pursuant to section 2883 of title 10, United States Code, providing alternative means of acquiring and improving military family housing and supporting facilities. Department of defense military unaccompanied housing improvement fund For the Department of Defense Military Unaccompanied Housing Improvement Fund, $600,000, to remain available until expended, for unaccompanied housing initiatives undertaken pursuant to section 2883 of title 10, United States Code, providing alternative means of acquiring and improving military unaccompanied housing and supporting facilities. Administrative provisions 101. None of the funds made available in this title shall be expended for payments under a cost-plus-a-fixed-fee contract for construction, where cost estimates exceed $25,000, to be performed within the United States, except Alaska, without the specific approval in writing of the Secretary of Defense setting forth the reasons therefor. 102. Funds made available in this title for construction shall be available for hire of passenger motor vehicles. 103. Funds made available in this title for construction may be used for advances to the Federal Highway Administration,