Issue No.04 - October-December (1981 vol.1)
B.J. Schachter , Westinghouse Defense & Electronics Systems Center
Visual simulation seems to imply image realism-though visual simulation systems can produce realistic images, their main goal Is training effectiveness.
B.J. Schachter, "Computer Image Generation for Flight Simulation", IEEE Computer Graphics and Applications, vol.1, no. 4, pp. 29-68, October-December 1981, doi:10.1109/MCG.1981.1674014