First up is 44-86893 now owned by Redbull. Let's see. I'm skinny, have hair, and there is no baby stroller in sight. I'd guess 1985 at the McConnell AFB open house where I flew KC-135R's from '84 to '90.
Next is 43-35972. It appears to be in the exact same spot as the picture of it, dated 1982, in Scott's book. I was at Williams AFB for all of 1982 so I 'd say this picture is the same year.
Finally, here's 43-27712 undergoing restoration at the Pima Air Museum about 1990 or 1991.