Responding to COVID-19 Among U.S. Military Units in South Korea: The U.S. Forces Korea's Operation Kill the Virus.

Introduction: The coronavirus disease 2019 (COVID-19) is a viral respiratory illness caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and has led to one of the world's largest infectious disease outbreaks. COVID-19 first emerged in Wuhan, Hubei, China, in December 2019, and the emergence was especially concerning to the U.S.