This definition appears very rarely
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Samples in periodicals archive:
A spokeswoman for the Puerto Rico National Guard, in which Lopez had served, and members of his family in Puerto Rico confirmed that he was the gunman.
The Soldiers and Airmen of the Puerto Rico National Guard and Air National Guard made sure we got into Port-au-Prince and back out repeatedly.
A member of the Puerto Rico National Guard, she plans to seek a commission through Army ROTC.