acquisition, construction, or expansion, and the purchase of not to exceed three aircraft, $1,902,000,000, to remain available until expended. Naval reactors (including transfer of funds) For Department of Energy expenses necessary for naval reactors activities to carry out the Department of Energy Organization Act ( 42 U.S.C. 7101 et seq.), including the acquisition (by purchase, condemnation, construction, or otherwise) of real property, plant, and capital equipment, facilities, and facility expansion, $1,788,618,000, to remain available until expended, of which, $85,500,000 shall be transferred to Department of Energy—Energy Programs—Nuclear Energy , for the Advanced Test Reactor: Provided , That of such amount, $48,709,000 shall be available until September 30, 2020, for program direction. Federal salaries and expenses For expenses necessary for Federal Salaries and Expenses in the National Nuclear Security Administration, $422,529,000, to remain available until September 30, 2020, including official reception and representation expenses not to exceed $12,000. Environmental and other defense activities Defense environmental cleanup For Department of Energy expenses, including the purchase, construction, and acquisition of plant and capital equipment and other expenses necessary for atomic energy defense environmental cleanup activities in carrying out the purposes of the Department of Energy Organization Act ( 42 U.S.C. 7101 et seq.), including the acquisition or condemnation of any real property or any facility or for plant or facility acquisition, construction, or expansion, and the purchase of not to exceed one passenger minivan for replacement only, $5,759,220,000, to remain available until expended: Provided , That of such amount, $295,000,000 shall be available until September 30, 2020, for program direction. Other defense activities For Department of Energy expenses, including the purchase, construction, and acquisition of plant and capital equipment and other expenses, necessary for atomic energy