Up for it!
I remember in the Victor B2 days before Blue Steel, we flew routine training flights between Goose Bay and Offutt. When filling out the strange flight plans at Goose and Offutt, we would include a code word that told whoever needed to know that we were up to being intercepted en - route by Canadian or USAF air defenders. They knew our routes as we flew through Radar Bomb Scoring Units on the way; however, although I was scanned a couple of times, never did anyone achieve a lock-on. But then I was usually around FL 480 so probably not surprising!!