subcontract award to any subcontractor or supplier as defined in section 1544 of title 25, United States Code, or a small business owned and controlled by an individual or individuals defined under section 4221(9) of title 25, United States Code, shall be considered a contractor for the purposes of being allowed additional compensation under section 504 of the Indian Financing Act of 1974 ( 25 U.S.C. 1544 ) whenever the prime contract or subcontract amount is over $500,000 and involves the expenditure of funds appropriated by an Act making appropriations for the Department of Defense with respect to any fiscal year: Provided further, That notwithstanding section 1906 of title 41, United States Code, this section shall be applicable to any Department of Defense acquisition of supplies or services, including any contract and any subcontract at any tier for acquisition of commercial items produced or manufactured, in whole or in part, by any subcontractor or supplier defined in section 1544 of title 25, United States Code, or a small business owned and controlled by an individual or individuals defined under section 4221(9) of title 25, United States Code. 8021. (a) Notwithstanding any other provision of law, the Secretary of the Air Force may convey at no cost to the Air Force, without consideration, to Indian tribes located in the States of Nevada, Idaho, North Dakota, South Dakota, Montana, Oregon, Minnesota, and Washington relocatable military housing units located at Grand Forks Air Force Base, Malmstrom Air Force Base, Mountain Home Air Force Base, Ellsworth Air Force Base, and Minot Air Force Base that are excess to the needs of the Air Force. (b) The Secretary of the Air Force shall convey, at no cost to the Air Force, military housing units under subsection (a) in accordance with the request for such units that are submitted to the Secretary by the Operation Walking Shield Program on behalf of Indian tribes located in the States of Nevada, Idaho, North Dakota, South Dakota, Montana, Oregon, Minnesota, and