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Then-2nd Lt. Nephtali Castillo, 509th Operational Medical Readiness Squadron Bioenvironmental engineer, lower left window, gives a virtual oath of enlistment to an Air National Guard enlistee on Puerto Rico via a web chat portal. Castillo spearheaded the implementation of a virtual oath of enlistment process for Air National Guard recruits on Puerto Rico. (Courtesy photo by 1st Lt. Nephtali Castillo)
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