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美国波音西科斯基公司的ＲＡＨ－６６柯曼奇直升机计划已获准从４月４号开始进入其工程与制造发展（ＥＭＤ）阶段，此阶段投资金额达３１亿美元。这项新的美国陆军航空兵现代化计划也已建议采购１２００多架柯曼奇直升机，其价值在整个计划的生产期内差不多３４０亿美元。国防
The Boeing Sikorsky RAH-66 Comanche helicopter program has been approved to enter its EMD stage from April 4, with an investment of $ 3.1 billion. The new U.S. Army Aviation modernization program has also advised the purchase of more than 1,200 Coombs helicopters, worth about 34 billion U.S. dollars throughout the planned life of the project. national defense