 The B-1B Lancer has served as America's primary long-range heavy bomber since 1985. Known as the Bone, the B-1's mission is to carry the largest conventional payload of weapons in the Air Force Inventory. With top speeds of over 900 miles per hour, the B-1 is a highly versatile, multi-mission weapons system capable of rapidly delivering massive quantities of precision and non-precision weapons against any adversary anywhere in the world at any time.