NACA National Advisory Committee on Aeronautics NACA then NACA then NACA NACA National Advisory Committee on Aeronautics Wikipedia NACA National Advisory Committee on Aeronautics NACA National Advisory Committee for Aeronautics National Advisory Committee on Aeronautics NACA NACA National Advisory Committee for Aeronautics NACA then NACA http://en.wikipedia.org/wiki/NACA National Advisory Committee for Aeronautics