Rockwell—B-1 Lancer: USAF Variants and Serials B-1B: One hundred B-1Bs were ordered for SAC between 1982 and 1986 with both production and test aircraft assigned the same designation. · 82-0001; 83-0065 to 83-0071; 84-0049 to 84-0058; 85-0059 to 85-0092; 86-0093 to 86-0140 GB-1A: One of four B-1As built, 74-0160 is employed by the Lowry TTC as a ground instruction trainer.