A KC-135 Stratotanker from Fairchild Air Force Base prepares to refuel a KC-46 Pegasus, with the KC-46 program's first test aircraft, a Boeing 767-2C (EMD-1). While the KC-46's role is to refuel other aircraft, it may need to refuel from other tankers to extend its range. Fuel Onload Fatigue testing is the first look at the KC-46 acting in that role. (U.S. Air Force photo/Christopher Okula)