Since 1959, the U. s. Air Force has increased the idea of space in its doctrines.
从1959年开始，美国空军的条令中逐步增加了航天内容。
The work has received funding from the U. S. Air Force Office of Scientific Research and NSF.
这项工作得到了资助科学研究的美国空军办公室和美国国家科学基金会。
Modified versions have also been developed for the U. S. Navy, Air Force, and Coast Guard.
修改后的版本也已经开发了为美国海军，空军和海岸警卫队。
Modified versions have also been developed for the U. S. Navy, Air Force, and Coast Guard.
修改后的版本也已经开发了为美国海军，空军和海岸警卫队。
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