The service members were deployed in support of ongoing security operations at the southern border.
By Tara Copp, AP
About 28,500 U.S. troops are stationed in South Korea, but the White House is considering changes to that military footprint.
Lawmakers expressed concerns that extra money for young troops could make some families ineligible for federal nutrition programs.
Squads had grown to 15 Marines during infantry battalion experiments in recent years.
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