Since 1997, the United States Congress has required the Department of Defense to undertake a major defense review every four years. The department is currently developing the third such review and will release it later this year.
美国的国防政策正处于转折点上。自1997年以来，美国国会就要求国防部每隔四年进行一次全面的国防评估。国防部目前正在进行第三次这样的评估，评估结果将在年底揭晓。这项评估据称将会具有分水岭式的意义。