; and (2) enter into multiyear contracts in accordance with section 3501 of such title. (g) Congressional notice and approval of contracts No contract may be entered into using amounts in the Fund until— (1) the Secretary of Defense submits to the congressional defense committees written notice of the intent to enter into such contract; and (2) a period of 15 days has elapsed following the date of the submittal of such notice. (h) Return of expired amounts Any amounts transferred to the Fund under subsection (c) that are unobligated on the date that is 10 years after the date of such transfer shall be returned to the general fund of the Treasury. (i) Reports (1) Reports on transfers and expenditures Not later than 90 days after the first transfer of amounts to the Fund under subsection (c), and not less frequently than once every 180 days thereafter, the Under Secretary of Defense for Acquisition and Sustainment shall submit to the congressional defense committees a report on expenditures made from the Fund. Each report shall identify— (A) the amount and source of any appropriations transferred to the Fund under subsection (c); (B) the specific expenditures for which such amounts were used after such transfer; and (C) the balance of funds remaining in the Fund. (2) Reports on expired amounts On a quarterly basis, the Secretary of Defense shall submit to the congressional defense committees a report identifying any amounts described in subsection (c)— (A) that are available and have not yet been transferred to the Fund; or (B) that are expected to become available for transfer to the fund, regardless of when such availability is expected to occur. (3) GAO review and verification Not later than 30 days after the submittal of each report described in paragraphs (1) and (2), the Comptroller General of the United States shall— (A) review and verify the information contained the report