KC-135 Stratotanker: Need a top-off? The Boeing KC-135 Stratotanker is a military aerial refueling aircraft that can transfer fuel loads up to 200,000 lbs, which can greatly extend the range and endurance of US tactical fighters and bombers. The KC-135 came into service in 1957, along with the U-2, and remains a vital part of the USAF today.
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