Made 138 flights (829.4 hours) as an offensive and defensive systems testbed before the B-1A program was cancelled in 1977. To Lowry AFB as as GB-1A ground trainer then preserved at the Wings Over the Rockies Aviation and Space Museum at the former Lowry AFB, Denver, CO from 1989.

This third (of four) B-1A prototypes was actually the second to fly. It eventually went to the Wings Over The Rockies Air & Space Museum near Denver, Colorado.