; reserve plant and Government and contractor-owned equipment layaway, $4,881,022,000, to remain available for obligation until September 30, 2019. Defense production act purchases For activities by the Department of Defense pursuant to sections 108, 301, 302, and 303 of the Defense Production Act of 1950 ( 50 U.S.C. 4518 , 4531, 4532, and 4533), $64,065,000, to remain available until expended. IV RESEARCH, DEVELOPMENT, TEST AND EVALUATION Research, development, test and evaluation, army For expenses necessary for basic and applied scientific research, development, test and evaluation, including maintenance, rehabilitation, lease, and operation of facilities and equipment, $8,332,965,000, to remain available for obligation until September 30, 2018. Research, development, test and evaluation, navy For expenses necessary for basic and applied scientific research, development, test and evaluation, including maintenance, rehabilitation, lease, and operation of facilities and equipment, $17,214,530,000, to remain available for obligation until September 30, 2018: Provided , That funds appropriated in this paragraph which are available for the V–22 may be used to meet unique operational requirements of the Special Operations Forces. Research, development, test and evaluation, air force For expenses necessary for basic and applied scientific research, development, test and evaluation, including maintenance, rehabilitation, lease, and operation of facilities and equipment, $27,788,548,000, to remain available for obligation until September 30, 2018. Research, Development, Test and Evaluation, Defense- W ide (including transfer of funds) For expenses of activities and agencies of the Department of Defense (other than the military departments), necessary for basic and applied scientific research, development, test and evaluation; advanced research projects as may be designated and determined by the Secretary of Defense, pursuant to law