Then-2nd Lt. Nephtali Castillo, 509th Operational Medical Readiness Squadron bioenvironmental engineer, briefs then-Secretary of Defense Dr. Mark T. Esper, during a base visit by the senior defense official to Whiteman Air Force Base, Mo., July 22, 2020. Castillo briefed Esper on his idea of bringing commissioned officer recruiting to his home island of Puerto Rico.
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