The Carl Levin and Howard P. "Buck" McKeon National Defense Authorization Act for Fiscal Year 2015 (proposed as , passed as , ) was a National Defense Authorization Act. According to the House Armed Services Committee, which oversaw the legislation, the bill would be "the comprehensive legislation to authorize the budget authority of the Department of Defense and the national security programs of the Department of Energy." The total appropriations that are authorized amount to approximately $600 billion for fiscal year 2015. The bill was introduced into the United States House of Representatives during the 113th United States Congress and signed into law on December 19, 2014. Background The National Defense Authorization Act (NDAA) is a United States federal law specifying the budget and expenditures of the United States Department of Defense. Each year's act also includes other provisions "that affect military personnel, retirees, and their family members." The U.S. Congress oversees the defense budget primarily through two yearly bills: the National Defense Authorization Act and defense appropriations bills. The authorization bill determines the agencies responsible for defense, establishes funding levels, and sets the policies under which money will be spent. This bill was named in honor of Howard P. "Buck" McKeon because he is leaving his post as chairman of the House Armed Services Committee at the end of the year. Provisions of the bill The House proposes to keep the Air Force's fleet of A-10 attack aircraft, which cost $635 million. The legislation banned any additional base closures, despite the Pentagon wanting to. The bill set the Pentagon's budget level at $495.8 billion. The bill included an overseas contingency operations budget of $79.4 billion. An additional $17.9 billion was authorized for defense programs in the Department of Energy. It incorporated the National Park Service 100th Anniversary Commemorative Coin Act. It established Blackstone River Valley National Historical Park, Harriet Tubman Underground Railroad National Historical Park, Harriet Tubman National Historical Park, Manhattan Project National Historical Park, and Valles Caldera National Preserve and authorized Coltsville National Historical Park which as of December 2020 has not yet been established. Clarification to the Bill Original versions of the bill would exempt the Department of Defense from having to adhere to the energy efficiency rules in the Energy Independence and Security Act of 2007. This portion of the bill was removed prior to the NDAA2015 being passed. Congressional Budget Office report This summary is