The National Advisory Committee for Aeronautics (NACA) was a U.S. federal agency founded on March 3, 1915, to undertake, promote, and institutionalize aeronautical research. On October 1, 1958, the agency was dissolved, and its assets and personnel transferred to the newly created National Aeronautics and Space Administration (NASA). NACA was pronounced as discrete letters, rather than as a whole word1 (and after NASA first came into being, it too was pronounced as discrete letters).2
With the creation of NASA in 1958, the NACA was abolished, and its research centers – Ames Research Center, Lewis Research Center, and Langley Aeronautical Laboratory – were incorporated within the new space and aeronautics agency along with some elements of the U.S. Army and U.S. Navy. In 1967, Congress directed NASA to form an Aerospace Safety Advisory Panel (ASAP) to advise the NASA Administrator on safety issues and hazards in NASA’s aerospace programs. In addition, there were the Space Program Advisory Council and the Research and Technology Advisory Council.
In 1977, these were all combined to form the NASA Advisory Council (NAC) which is the successor to the National Advisory Committee for Aeronautics.(Wikipedia)