Question: The 56th Air Refueling Squadron is an active unit of the United States Air Force, it operates Boeing KC-46 Pegasus aircraft, conducting initial and advanced aircrew training for air refueling operations, the Boeing KC-46 Pegasus is a military aerial refueling and strategic military transport aircraft developed by Boeing, from which one of its jet airliner?
Sentence (from "Boeing KC-46 Pegasus"): In February 2011, the tanker was selected by the United States Air Force (USAF) as the winner in the KC-X tanker competition to replace older KC-135 Stratotankers.
Relevant evidence: No