KC-135 MOD program closes out year with magic number: Block 45
The flight deck of a KC-135R Stratotanker after completing the Block 45 avionics upgrade Nov. 15, 2016, at Tinker Air Force Base, Okla. Block 45 completely remodels the inside of the flight deck with new liquid crystal displays, radio altimeter, autopilot, digital flight director and other computer module updates. (U.S. Air Force photo/Greg L. Davis)