Research, Development, Test, and Evaluation, air Force

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, as authorized by law, $1,552,863,000, to remain available until expended: Provided, That during the current fiscal year there may be merged with this appropriation such amounts of the unexpended balances of appropriations heretofore made available for research, development, test, and evaluation, as the Secretary of Defense may determine to be necessary for the accomplishment of the programs for which this appropriation is made: Provided further, That no part of this appropriation shall be used for construction, maintenance, or rental of missile testing facilities until the fullest practical use is made of testing facilities and equipment at existing installations or those now under construction.