 In October 1995, the first E-3 AWACS aircraft (tail number 80-137) to receive the Block 30/35 upgrade rolled out at Tinker Air Force Base.The Block 30/35 comprised the single largest upgrade to the E-3 aircraft ever accomplished.Block 30/35 affected four major subsystems aboard the E-3 aircraft including integration of Joint Tactical Information Distribution Systems, Global Position System, Electronic Support Measures System, and Data Analysis Program Group.