Boeing and the 418th Flight Test Squadron are conducting ground effects and fuel onload fatigue testing on the new KC-46A Pegasus. Fuel onload fatigue tests will gather data to characterize the aircraft interaction typically experienced when the KC-46A is flying in receiver formation behind a current KC-135 Stratotanker or KC-10 Extender. While the KC-46's role is to refuel other aircraft, it too may need to be refueled from other KC-10s or KC-135s to extend its range. Fuel onload fatigue testing is the first look at the KC-46 acting in that role.