美军决定将入伍年龄提高至42岁，背后的原因是什么？
美国陆军征兵标准的变化可能是为了增加征兵，因为近年来征兵人数一直滞后。
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来源: Al Jazeera
Changes in US Army enlistment standards could be an effort to boost recruitment as numbers have lagged in recent years.