The decision came after the service lost confidence in the commander's ability to lead, according to the Marine Corps.
The service members were deployed in support of ongoing security operations at the southern border.
By Tara Copp, AP
The new policy aims to revitalize a U.S. shipbuilding industry that has fallen well behind production levels of its rivals from Beijing.
Squads had grown to 15 Marines during infantry battalion experiments in recent years.
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