建议如下world后的is改成has been所有的The U.S. Army-需要将the的首字母改成小写t美国陆军的专有名词是United States ArmyIt was the U. S. army who first enter into information age中的who需要改成that,然后把enter后加s,因为这里是把美国陆军看成一个整体其它都还好
差不多对,比较好