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The KC-135, introduced to the USAF in 1957, remains a crucial refueling aircraft, with upgrades to the KC-135E and KC-135R variants enhancing its capabilities. It plays multiple roles, including reconnaissance and command post functions, and has notably supported the SR-71 Blackbird through the KC-135Q variant. Its design has also influenced a range of Boeing transports, including the 707, 727, and 737, with the RAAF adapting its Boeing 707s for tanker operations.