The Air Force, Navy and Marine Corps have increased their use of air support contracts from fiscal year 2015 to FY-20, spending a total of $8.4 billion during that period, according to a Government Accountability Office report released Tuesday . GAO found the Air Force, Navy and Marine Corps are taking steps to increase efficiencies for air support contracts used for training and are working to determine the effectiveness of these contracts. The FY-21 National Defense Authorization Act called on...