Interesting history. As a 28 year retired USAF from Aug 1957 to Apr 1985 I served with SAC at Castle AFB, CA, Altus AFB, OK and Wertsmith AFB, MI (now Kalita's home base). As a major command Inspector General Maintenance Inspector I walked on, in, around and through every major weapon system and engines that were in the inventory at the time of my retirement. Never said later models weren't still in the inventory. But thank you for the update on the later models. Just saw a B-2 fly touch and goes Sunday as I was playing golf at WPAFB, OH.