Air-Battle System © 1959 Unknown.
A large scale computer simulation that was designed for the study of military combat operations.
The program was written in CL-1 programming language for the IBM-709 computer. It has over 40,000 instructions!
it was first developed in the mid-1950's and has undergone considerable evolution until mid 60s. It was later renamed STAGE (Simulation of Total Atomic Global Exchange).
Game Playing with Computers, Donald D. Spencer (1968) Page 12