陆军打算采用低空防御导弹系统来保护象民兵、MX洲际弹道导弹场地、轰炸机基地或重要的指挥控制中心等重大的目标。 为帮助完成这一系统的初样论证工作,陆军需要三家承包商,现已选定两家。被选中参与低空防御(LoAD)计划的这两家公司是:麦克唐纳·道格拉斯公司(负责系统工程和试验)和马丁·玛丽埃塔公司(负责 The Army intends to use low-level defensive missile systems to protect major targets such as militias, MX intercontinental ballistic missile sites, bomber bases or major command and control centers. In order to assist in the initial demonstration of this system, the Army needs three contractors and two are now selected. The two companies selected to participate in the LoAD program are: McDonnell Douglas (Systems Engineering and Testing) and Martin Marietta