Emblem of National Advisory Committee for Aeronautics, precursor agency to NASA. Full Description: On April 24, 1941, at the semi-annual meeting of the National Advisory Committee for Aeronautics, the official NACA Standard Seal was approved to be used on buildings under construction. The insignia portrayed a shield with a wing on either side and the letters "NACA" inscribed across it.
NACA
GPN-2000-001539