Thirteen years of sustained U.S. combat troop presence in war zones overseas compelled the U.S. Marine Corps to set aside its expeditionary nature and dig in alongside its U.S. Army counterpart for long deployments and occupying mis-sions. The longest war in U.S. history-the Afghanistan War-had Marines conducting yearlong assignments to expunge terrorists, train foreign armies and security forces and help rebuild nations torn apart by the punishing battles.
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