I was in the Air Force in 1968 through 1973 and we used Univac 418 II computers in the Air Force overseas nodes (England, Japan and Phillipines) and both the 418 II and
418 III at the Communications Computer Programming Center at Tinker AFB outside of Oklahome City. All in all I think Univac made approximately 500 Univac 418 I, 418 II, and 418 III computers.