F-106B 57-2516, NASA ID No. N616NA of the NASA Lewis Research Center, Cleveland OH (NASA N816NA at Langley Research Center, Hampton VA) in 1968 during a test flight of Underwing Supersonic Cruise Exhaust Nozzles during Transonic Speeds Research. Two 25 inch diameter J85 nacelles designed to contain the J85-GE-13 afterburning turbojet engines. The left wing engine had a Research Inlet and Research Exhaust Nozzle, while the right wing engine was for Reference with an open inlet and cylindrical nozzle. [NASA via Earle Boyer collection]