The sudden recent rise to prominence of cybernetics was due, immediately, to World War II. There existed then a series of problems which had not previously been met. The main one was that of range-finding for anti-aircraft guns in high-speed aerial warfare. The older systems involved human computers and these, with manually controlled locators, were wholly inadequate for the job in hand. The essence of the process involved was to track and predict the direction, velocity, and height of enemy aircraft. The human being's part in the operation was much too slow and inaccurate, and there were people available with machines already developed to do the job adequately; these machines were, of course, computing machines.

p.18 - The Brain As A Computer (1962)