 The B-1 of the early 1970s eventually emerged with a price tag around $200 million (equivalent to $ million in ) while the Minuteman-IIIs built during the 1970s cost only $7 million ($ million in ).The Air Force countered that having a variety of platforms complicated the defense; if the Soviets built an effective anti-ballistic missile system of some sort, the ICBM and SLBM fleet might be rendered useless, while the bombers would remain.This became the nuclear triad concept, which survives into the present.