U.S. Marine Cpl. Mario Ramos-Villalta put on his freshly pressed uniform early Thursday as a citizen of El Salvador. By the end of the day, he would be a citizen of the United States of America.
"I am an American," he said with a smile moments after his paperwork cleared.
"It means a lot to me after so many years and two combat deployments, I finally get it, being an American. We are happy about it." 
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CNN's Manuel Perez contributed to this report.
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