Troops are authorized to take custody of migrants who illegally cross the border within the zone until they are transferred to civilian authorities.
Kevin DiFalco faces charges of sexual abuse of a child, indecent conduct, giving false testimony and possession of child pornography, among others.
The service members were deployed in support of ongoing security operations at the southern border.
By Tara Copp, AP
Squads had grown to 15 Marines during infantry battalion experiments in recent years.
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