The service members were deployed in support of ongoing security operations at the southern border.
By Tara Copp, AP
The commander's comments come amid concerns from Congress that the Pentagon is considering reducing the number of U.S. troops on the continent.
Squads had grown to 15 Marines during infantry battalion experiments in recent years.
An Army veteran-turned-stand-up comedian discusses the importance of laughter in the wake of trauma.
By Clay Beyersdorfer
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