The KC-135Q model tankers were "unique" within the Air Force and thus, earned the "Q" model designation. The aircrews of the "Q" model tankers were the only ones certified in our "unique" radio silent rendezvous procedures, and their boom operators were the only ones qualified to refuel the SR-71.
The KC-135 provided the basis for Boeing's Model 707 civil airliner and Model 717 (C-135) tanker/transport families, and also set the design philosophy which extended throughout Boeing's hugely successful airliner dynasty.
 
 

The Q model tankers had special plumbing between their fuel tanks, allowing them to move JP-4 and the JP-7 fuel used exclusively by the SR-71, between various tanks. This design gave the KC-135Q the distinction of being the only airplane capable of refueling the fastest airplane in the world. Also, if the SR-71 landed somewhere JP-7 fuel was not available, we used the "Qs" to ferry our fuel.

A special bond developed between our tanker and SR-71 crews that didn't exist throughout the Air Force. They took considerable pride in their work because of the exclusive SR-71 refueling. They knew, and so did we, that the SR-71's mission success was directly related to our ability to get refueled in the air. They were always there, somewhere in the murk and dark of night, with a full load of JP-7 waiting for us.

 
  Specifications

Primary Function: Aerial refueling

Prime Contractor: Boeing
Power Plant: Four Pratt and Whitney J-57 turbofan engines
Length: 136 feet, 3 inches
Height: 41 feet, 8 inches
Wingspan: 130 feet, 10 inches
Speed: 530 miles per hour at 30,000 feet
Ceiling:  50,000 feet
Date Deployed: August 1965
 
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