Senator John McCain (R-AZ) sent a letter July 27 to Navy Secretary Ray Mabus charging that the Navy’s July 19 Great Green Fleet demonstration, which featured the operation of aircraft and surface ships using advanced biofuels, was not authorized by Congress. The letter comes two months after the Senate Armed Services Committee passed the National Defense Authorization Act for Fiscal Year 2013 (S. 3254) and almost three months after the House passed its version of the bill (H.R. 4310); both bills would restrict the Pentagon’s ability to purchase biofuels.